This document proposes a new decentralized access control scheme for secure data storage in clouds that supports anonymous authentication. The key points are:
1) It allows for multiple key distribution centers (KDCs) so the architecture is decentralized. This prevents any single point of failure.
2) It provides anonymous authentication of users storing data in the cloud so their identity is protected from the cloud.
3) Only authorized users with valid attributes can access data, so it enables fine-grained and distributed access control. The scheme is resilient against replay and collusion attacks.
Authentication on Cloud using Attribute Based EncryptionAnkit Raj
Improving Cloud Security for Authentication using Attribute Based Encryption.
Attribute-based encryption is a type of public key encryption in which the secret key of a user and the cipher text are dependent upon attributes. The decryption of a cipher text is possible only if the set of attributes of the user key matches the attributes of the cipher text. A crucial security aspect of Attribute-Based Encryption is collusion-resistance: An adversary that holds multiple keys should only be able to access data if at least one individual key grants access. Cloud computing is a type of Internet-based computing that provides shared computer processing resources and data to computers and other devices on demand. Cloud computing and storage solutions provide users and enterprises with various capabilities to store and process their data in third-party data centers that may be located far from the user–ranging in distance from across a city to across the world. There were several cases of security breach on the cloud in the past few year and data security was compromised like Adobe’s Security Breach, Amazon website failure and many security attacks like this motivated us to work on strict security measures on cloud. In such a system, a user provides an untrusted server, say a cloud service provider, with a transformation key that allows the cloud to translate any ABE cipher text satisfied by that user’s attributes into a simple cipher text, and it only incurs a small computational overhead for the user to recover the plaintext from the transformed cipher text. Security of an ABE system with outsourced decryption ensures that an adversary including a malicious cloud will not be able to learn anything about the encrypted message. The formal model of ABE with outsourced decryption forms a concrete scheme. Data owner decides the access using combinations of or policies and encrypt the file and corresponding authentic user can decrypt it using their policies.
Final_attribute based encryption in cloud with significant reduction of compu...Naveena N
This document describes a student project that aims to improve ciphertext-policy attribute-based encryption (CP-ABE) for cloud storage. The project proposes a hierarchical CP-ABE structure to enhance scalability and flexibility while eliminating reliance on the storage server for access control. Performance measurements showed the scheme efficiently manages stored data and significantly reduces computation time required for decryption on resource-limited devices.
A Fully Anonymous Attribute-Based Encryption to Control Cloud Data Access and...Pawan Arya
The document describes a proposed fully anonymous attribute-based encryption system to control access to cloud data while protecting user anonymity. It discusses the motivation for privacy in cloud computing and outlines the design of the proposed AnonyControl-F system using multiple attribute authorities. The system is implemented and tested, demonstrating that authorized users can access encrypted data when their attributes match the access policy, while attribute authorities cannot determine which attributes a user possesses.
Attribute-based encryption (ABE) is a public-key based one-to-many encryption that allows users to encrypt and decrypt data based on user attributes.
A promising application of ABE is flexible access control of encrypted data stored in the cloud, using access polices and ascribed attributes associated with private keys and ciphertexts.One of the main efficiency drawbacks of the existing ABE schemes is that decryption involves expensive pairing operations and the number of such operations grows with the complexity of the access policy. Recently, Green et al. proposed an ABE system with outsourced decryption that largely eliminates the decryption overhead for users.
In such a system, a user provides an untrusted server, say a cloud service provider, with a transformation key that allows the cloud to translate any ABE cipher text satisfied by that user’s attributes or access policy into a simple cipher text, and it only incurs a small computational overhead for the user to recover the plaintext from the transformed cipher text.
Security of an ABE system with outsourced decryption ensures that an adversary (including a malicious cloud) will not be able to learn anything about the encrypted message; however, it does not guarantee the correctness of the transformation done by the cloud.
In this paper, we consider a new requirement of ABE with outsourced decryption: verifiability. Informally, verifiability guarantees that a user can efficiently check if the transformation is done correctly.
We give the formal model of ABE with verifiable outsourced decryption and propose a concrete scheme. We prove that our new scheme is both secure and verifiable, without relying on random oracles.
Finally, we show an implementation of our scheme and result of performance measurements, which indicates a significant reduction on computing resources imposed on users.
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Hasbe a hierarchical attribute based solution for flexible and scalable acces...parry prabhu
The document proposes a Hierarchical Attribute-Set-Based Encryption (HASBE) scheme to provide scalable and flexible access control for outsourced data in cloud computing. HASBE extends Ciphertext-Policy Attribute-Set-Based Encryption with a hierarchical user structure for scalability. It also supports compound attributes for flexibility and fine-grained access control. HASBE employs multiple expiration times to more efficiently revoke users compared to existing schemes. The security of HASBE is formally proven based on CP-ABE security. The scheme is implemented and experiments show it efficiently and flexibly handles access control for outsourced cloud data.
Attribute Based Encryption with Privacy Preserving In Clouds Swathi Rampur
This is a ppt made by shrihari ,in this encryption with privacy preserving in clouds is described!
It will be helpfull for those who are doing projects on cloud!
Authentication on Cloud using Attribute Based EncryptionAnkit Raj
Improving Cloud Security for Authentication using Attribute Based Encryption.
Attribute-based encryption is a type of public key encryption in which the secret key of a user and the cipher text are dependent upon attributes. The decryption of a cipher text is possible only if the set of attributes of the user key matches the attributes of the cipher text. A crucial security aspect of Attribute-Based Encryption is collusion-resistance: An adversary that holds multiple keys should only be able to access data if at least one individual key grants access. Cloud computing is a type of Internet-based computing that provides shared computer processing resources and data to computers and other devices on demand. Cloud computing and storage solutions provide users and enterprises with various capabilities to store and process their data in third-party data centers that may be located far from the user–ranging in distance from across a city to across the world. There were several cases of security breach on the cloud in the past few year and data security was compromised like Adobe’s Security Breach, Amazon website failure and many security attacks like this motivated us to work on strict security measures on cloud. In such a system, a user provides an untrusted server, say a cloud service provider, with a transformation key that allows the cloud to translate any ABE cipher text satisfied by that user’s attributes into a simple cipher text, and it only incurs a small computational overhead for the user to recover the plaintext from the transformed cipher text. Security of an ABE system with outsourced decryption ensures that an adversary including a malicious cloud will not be able to learn anything about the encrypted message. The formal model of ABE with outsourced decryption forms a concrete scheme. Data owner decides the access using combinations of or policies and encrypt the file and corresponding authentic user can decrypt it using their policies.
Final_attribute based encryption in cloud with significant reduction of compu...Naveena N
This document describes a student project that aims to improve ciphertext-policy attribute-based encryption (CP-ABE) for cloud storage. The project proposes a hierarchical CP-ABE structure to enhance scalability and flexibility while eliminating reliance on the storage server for access control. Performance measurements showed the scheme efficiently manages stored data and significantly reduces computation time required for decryption on resource-limited devices.
A Fully Anonymous Attribute-Based Encryption to Control Cloud Data Access and...Pawan Arya
The document describes a proposed fully anonymous attribute-based encryption system to control access to cloud data while protecting user anonymity. It discusses the motivation for privacy in cloud computing and outlines the design of the proposed AnonyControl-F system using multiple attribute authorities. The system is implemented and tested, demonstrating that authorized users can access encrypted data when their attributes match the access policy, while attribute authorities cannot determine which attributes a user possesses.
Attribute-based encryption (ABE) is a public-key based one-to-many encryption that allows users to encrypt and decrypt data based on user attributes.
A promising application of ABE is flexible access control of encrypted data stored in the cloud, using access polices and ascribed attributes associated with private keys and ciphertexts.One of the main efficiency drawbacks of the existing ABE schemes is that decryption involves expensive pairing operations and the number of such operations grows with the complexity of the access policy. Recently, Green et al. proposed an ABE system with outsourced decryption that largely eliminates the decryption overhead for users.
In such a system, a user provides an untrusted server, say a cloud service provider, with a transformation key that allows the cloud to translate any ABE cipher text satisfied by that user’s attributes or access policy into a simple cipher text, and it only incurs a small computational overhead for the user to recover the plaintext from the transformed cipher text.
Security of an ABE system with outsourced decryption ensures that an adversary (including a malicious cloud) will not be able to learn anything about the encrypted message; however, it does not guarantee the correctness of the transformation done by the cloud.
In this paper, we consider a new requirement of ABE with outsourced decryption: verifiability. Informally, verifiability guarantees that a user can efficiently check if the transformation is done correctly.
We give the formal model of ABE with verifiable outsourced decryption and propose a concrete scheme. We prove that our new scheme is both secure and verifiable, without relying on random oracles.
Finally, we show an implementation of our scheme and result of performance measurements, which indicates a significant reduction on computing resources imposed on users.
http://kaashivinfotech.com/
http://inplanttrainingchennai.com/
http://inplanttraining-in-chennai.com/
http://internshipinchennai.in/
http://inplant-training.org/
http://kernelmind.com/
http://inplanttraining-in-chennai.com/
http://inplanttrainingchennai.com/
Hasbe a hierarchical attribute based solution for flexible and scalable acces...parry prabhu
The document proposes a Hierarchical Attribute-Set-Based Encryption (HASBE) scheme to provide scalable and flexible access control for outsourced data in cloud computing. HASBE extends Ciphertext-Policy Attribute-Set-Based Encryption with a hierarchical user structure for scalability. It also supports compound attributes for flexibility and fine-grained access control. HASBE employs multiple expiration times to more efficiently revoke users compared to existing schemes. The security of HASBE is formally proven based on CP-ABE security. The scheme is implemented and experiments show it efficiently and flexibly handles access control for outsourced cloud data.
Attribute Based Encryption with Privacy Preserving In Clouds Swathi Rampur
This is a ppt made by shrihari ,in this encryption with privacy preserving in clouds is described!
It will be helpfull for those who are doing projects on cloud!
Decentralized access control with anonymous authentication of data stored in ...Adz91 Digital Ads Pvt Ltd
The document proposes a decentralized access control scheme for secure data storage in clouds that supports anonymous authentication. The scheme allows clouds to verify the authenticity of users without knowing their identity before storing data. It also enables access control so that only valid users can decrypt stored information. The scheme prevents replay attacks and supports creation, modification, and reading of stored data. It further addresses user revocation and uses a decentralized approach for key distribution, unlike other centralized access control schemes for clouds.
This document summarizes a research paper that proposes a public auditing scheme for regenerating-code-based cloud storage. The scheme introduces a proxy that can regenerate authenticators on behalf of data owners to solve issues when authenticators fail in the absence of owners. It also designs a novel public verifiable authenticator generated using keys that can be regenerated using partial keys. Extensive analysis shows the scheme is provably secure and efficient enough to integrate into regenerating-code-based cloud storage.
Messages addressed to specific users can be decrypted by Key Generation Centre (KGC) by generating their private keys. Data owner wants the data to be delivered only to specified user and not to unauthorized person that is the data owner makes their private data accessible only to authorized person. We propose attribute based encryption and escrow problem which means written agreement delivered to a third party to overcome this problem. Attribute based Encryption (ABE) is a type of public-key encryption in which the private key of a user and the cipher text are dependent upon attributes. It is a promising cryptographic approach.
For further details contact:
N.RAJASEKARAN B.E M.S 9841091117,9840103301.
IMPULSE TECHNOLOGIES,
Old No 251, New No 304,
2nd Floor,
Arcot road ,
Vadapalani ,
Chennai-26.
Decentralized access control with anonymous authentication of data stored in ...Nexgen Technology
Ecruitment Solutions (ECS) is one of the leading Delhi based Software Development & HR Consulting Firm, which is assessed at the level of ISO 9001:2008 standard. ECS offers an awesome project and product based solutions to many customers around the globe.
In addition, ECS has also widened its wings by the way consummating academic projects especially for the final year professional degree students in India. ECS consist of a technical team that has solved many IEEE papers and delivered world-class solutions .
An Attribute-based Controlled Collaborative Access Control Scheme for Public ...JAYAPRAKASH JPINFOTECH
An Attribute-based Controlled Collaborative Access Control Scheme for Public Cloud Storage
To buy this project in ONLINE, Contact:
Email: jpinfotechprojects@gmail.com,
Website: https://www.jpinfotech.org
Privacy preserving public auditing for regenerating-code-based cloud storageLeMeniz Infotech
Privacy preserving public auditing for regenerating-code-based cloud storage
Do Your Projects With Technology Experts
To Get this projects Call : 9566355386 / 99625 88976
Visit : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
A Survey on Access Control Mechanisms using Attribute Based Encryption in cloudijsrd.com
Cloud computing is an emerging computing technology that enables users to distantly store their data into a cloud so as to enjoy scalable services when required. And user can outsource their resources to server (also called cloud) using Internet. Security is one of the major issues which reduces the growth of cloud computing and complications with data privacy and data protection continue to plague the market. Attribute-based encryption (ABE) can be used for log encryption. This survey is more specific to the different security issues on data access in cloud environment.
Privacy Preserving Public Auditing for Data Storage Security in Cloud.pptGirish Chandra
Introducing TPA(Third Party Auditor) to the cloud.It sends the information about the data stored in the cloud.It informs the user when any unauthorized user tries to steal his data from the cloud.
Decentralized access control with anonymous authentication of data stored in ...LeMeniz Infotech
Decentralized access control with anonymous authentication of data stored in clouds
A new decentralized access control scheme is proposed for secure data storage in clouds that supports anonymous authentication. In the proposed scheme, the cloud verifies the authenticity of the series without knowing the user’s identity before storing data. Access control is enabled, in which only valid users are able to decrypt the stored information.
The document proposes a Session Based Ciphertext Policy Attribute Based Encryption (SB-CP-ABE) method for access control in cloud storage. SB-CP-ABE aims to enable efficient key refreshing and revocation in ciphertext policy attribute based encryption (CP-ABE) schemes. It introduces the concept of associating private keys with sessions, so that key updates and revocations only need to be done at session boundaries, avoiding the need for frequent re-encryption of ciphertexts. The method can be generically applied to existing CP-ABE schemes to improve their practicality for cloud storage environments.
CLOUD BASED ACCESS CONTROL MODEL FOR SELECTIVE ENCRYPTION OF DOCUMENTS WITH T...IJNSA Journal
This document proposes a cloud-based access control model for selectively encrypting documents with traitor detection. It aims to address the high computational overhead of key management and secret sharing in existing attribute-based encryption approaches for cloud data security. The proposed model uses efficient algorithms and protocols like aggregate equality oblivious commitment-based envelope protocol and fast access control vector broadcast group key management to reduce overhead. It also introduces a traitor tracing technique to identify any traitors in the two-layer encryption environment for cloud computing.
766 a secure-data-sharing-in-cloud-storage-with-independent-key-generation-ce...revathirram
This document summarizes a research paper that proposes a mediated certificateless public key encryption (mCL-PKE) scheme for secure data sharing in cloud storage. The key points are:
1) The mCL-PKE scheme solves problems of key escrow and certificate revocation without using computationally expensive bilinear pairing operations.
2) It uses a security mediator to instantly revoke compromised users and enforce access policies. The mediator also supports partial decryption to preserve data confidentiality.
3) The scheme extends mCL-PKE with an access control list to allow the data owner to encrypt data only once for multiple authorized users, improving efficiency over previous pairing-based schemes.
This document proposes a system for public auditing of data stored in the cloud while preserving privacy. It uses homomorphic linear authenticators with random masking to guarantee data privacy. A third party auditor is used to verify the integrity of outsourced data on demand without retrieving the entire dataset. The system aims to prevent data leakage and enhance security with mobile message alerts when unauthorized access is detected. It further improves auditing using a multicast batch RSA authentication scheme.
PUBLIC AUDITING FOR SECURE CLOUD STORAGE ...Bharath Nair
This document outlines a presentation on public auditing for secure cloud storage. It discusses the objective of developing a system to allow cloud users to ensure their data is secure and not corrupted. It covers topics like introduction to cloud computing, literature review on existing methods, problem description, the proposed method, applications, discussion of base paper, execution tools, and conclusions. The proposed method aims to enable public auditing of cloud storage without requiring local data copies, providing privacy and efficiency.
Secure Redundant Data Avoidance over Multi-Cloud Architecture. IJCERT JOURNAL
Redundant data avoidance systems, the Private Cloud are involved as a proxy to allow data owner/users to securely perform duplicate check with differential privileges. Such architecture is practical and has attracted much attention from researchers. The data owners only outsource their data storage by utilizing public cloud while the data operation is managed in private cloud, in this connection our presented system has follows traditional encryption while providing data confidentiality, is incompatible with redundant data avoidance. Identical data copies of different users will lead to different ciphertexts, making data avoidance impossible. To address above issues convergent encryption technique has been proposed to encrypt the data before outsourcing. To better protect data security, this paper makes the first attempt to formally address the problem of authorized redundant data avoidance. Different from traditional redundant data avoidance systems, the differential privileges of users are further considered in duplicate check besides the data itself. We also present several new redundant data avoidance constructions supporting authorized duplicate check in a multi-cloud architecture. Security analysis demonstrates that our scheme is secure in terms of the definitions specified in the proposed security model. In order to perform secure access controlling scheme user may satisfy fine-grained approach at cloud level towards access restricting from unauthorized users or adversaries.
Control cloud data access privilege and anonymity with fully anonymous attri...LeMeniz Infotech
Control cloud data access privilege and anonymity with fully anonymous attribute based encryption
Do Your Projects With Technology Experts
To Get this projects Call : 9566355386 / 99625 88976
Visit : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Audit free cloud storage via deniable attribute based encryptionMano Sriram
1) Cloud storage services have become popular, but user privacy is a concern as data owners do not want unauthorized access. Existing encryption schemes assume cloud providers are trusted, but they could be forced to reveal secrets.
2) The document proposes a new encryption scheme called deniable Ciphertext Policy Attribute Based Encryption (CP-ABE) that allows cloud providers to create fake user secrets, protecting real secrets even if the provider is coerced.
3) By using deniable CP-ABE, cloud providers can convince coercers that obtained secrets are genuine while actually protecting user privacy, addressing a key limitation of prior encryption schemes.
DECENTRALIZED ACCESS CONTROL OF DATA STORED IN CLOUD USING KEY POLICY ATTRIBU...Migrant Systems
This document proposes a decentralized access control method for data stored in the cloud using key policy attribute-based encryption (KP-ABE). It aims to allow fine-grained access control while maintaining data confidentiality and scaling efficiently. The method defines and implements access policies based on data attributes. It also allows the data owner to delegate access control tasks to cloud servers without revealing data contents. This is achieved using a combination of decentralized KP-ABE and a time-based file deletion scheme. The proposed approach is analyzed and shown to be highly secure and efficient.
A Privacy Preserving Attribute Based Access Control Mechanism In Distributed ...Editor IJCATR
We propose a new decentralized access control scheme for secure data storage in clouds that supports anonymous
authentication. In the proposed scheme, the cloud verifies the authenticity of the series without knowing the user’s identity before
storing data. Our scheme also has the added feature of access control in which only valid users are able to decrypt the stored
information. The scheme prevents replay attacks and supports creation, modification, and reading data stored in the cloud. We also
address user revocation. Moreover, our authentication and access control scheme is decentralized and robust, unlike other access
control schemes designed for clouds which are centralized. The communication, computation, and storage overheads are comparable
to centralized approaches.
Decentralized access control with anonymous authentication of data stored in ...Adz91 Digital Ads Pvt Ltd
The document proposes a decentralized access control scheme for secure data storage in clouds that supports anonymous authentication. The scheme allows clouds to verify the authenticity of users without knowing their identity before storing data. It also enables access control so that only valid users can decrypt stored information. The scheme prevents replay attacks and supports creation, modification, and reading of stored data. It further addresses user revocation and uses a decentralized approach for key distribution, unlike other centralized access control schemes for clouds.
This document summarizes a research paper that proposes a public auditing scheme for regenerating-code-based cloud storage. The scheme introduces a proxy that can regenerate authenticators on behalf of data owners to solve issues when authenticators fail in the absence of owners. It also designs a novel public verifiable authenticator generated using keys that can be regenerated using partial keys. Extensive analysis shows the scheme is provably secure and efficient enough to integrate into regenerating-code-based cloud storage.
Messages addressed to specific users can be decrypted by Key Generation Centre (KGC) by generating their private keys. Data owner wants the data to be delivered only to specified user and not to unauthorized person that is the data owner makes their private data accessible only to authorized person. We propose attribute based encryption and escrow problem which means written agreement delivered to a third party to overcome this problem. Attribute based Encryption (ABE) is a type of public-key encryption in which the private key of a user and the cipher text are dependent upon attributes. It is a promising cryptographic approach.
For further details contact:
N.RAJASEKARAN B.E M.S 9841091117,9840103301.
IMPULSE TECHNOLOGIES,
Old No 251, New No 304,
2nd Floor,
Arcot road ,
Vadapalani ,
Chennai-26.
Decentralized access control with anonymous authentication of data stored in ...Nexgen Technology
Ecruitment Solutions (ECS) is one of the leading Delhi based Software Development & HR Consulting Firm, which is assessed at the level of ISO 9001:2008 standard. ECS offers an awesome project and product based solutions to many customers around the globe.
In addition, ECS has also widened its wings by the way consummating academic projects especially for the final year professional degree students in India. ECS consist of a technical team that has solved many IEEE papers and delivered world-class solutions .
An Attribute-based Controlled Collaborative Access Control Scheme for Public ...JAYAPRAKASH JPINFOTECH
An Attribute-based Controlled Collaborative Access Control Scheme for Public Cloud Storage
To buy this project in ONLINE, Contact:
Email: jpinfotechprojects@gmail.com,
Website: https://www.jpinfotech.org
Privacy preserving public auditing for regenerating-code-based cloud storageLeMeniz Infotech
Privacy preserving public auditing for regenerating-code-based cloud storage
Do Your Projects With Technology Experts
To Get this projects Call : 9566355386 / 99625 88976
Visit : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
A Survey on Access Control Mechanisms using Attribute Based Encryption in cloudijsrd.com
Cloud computing is an emerging computing technology that enables users to distantly store their data into a cloud so as to enjoy scalable services when required. And user can outsource their resources to server (also called cloud) using Internet. Security is one of the major issues which reduces the growth of cloud computing and complications with data privacy and data protection continue to plague the market. Attribute-based encryption (ABE) can be used for log encryption. This survey is more specific to the different security issues on data access in cloud environment.
Privacy Preserving Public Auditing for Data Storage Security in Cloud.pptGirish Chandra
Introducing TPA(Third Party Auditor) to the cloud.It sends the information about the data stored in the cloud.It informs the user when any unauthorized user tries to steal his data from the cloud.
Decentralized access control with anonymous authentication of data stored in ...LeMeniz Infotech
Decentralized access control with anonymous authentication of data stored in clouds
A new decentralized access control scheme is proposed for secure data storage in clouds that supports anonymous authentication. In the proposed scheme, the cloud verifies the authenticity of the series without knowing the user’s identity before storing data. Access control is enabled, in which only valid users are able to decrypt the stored information.
The document proposes a Session Based Ciphertext Policy Attribute Based Encryption (SB-CP-ABE) method for access control in cloud storage. SB-CP-ABE aims to enable efficient key refreshing and revocation in ciphertext policy attribute based encryption (CP-ABE) schemes. It introduces the concept of associating private keys with sessions, so that key updates and revocations only need to be done at session boundaries, avoiding the need for frequent re-encryption of ciphertexts. The method can be generically applied to existing CP-ABE schemes to improve their practicality for cloud storage environments.
CLOUD BASED ACCESS CONTROL MODEL FOR SELECTIVE ENCRYPTION OF DOCUMENTS WITH T...IJNSA Journal
This document proposes a cloud-based access control model for selectively encrypting documents with traitor detection. It aims to address the high computational overhead of key management and secret sharing in existing attribute-based encryption approaches for cloud data security. The proposed model uses efficient algorithms and protocols like aggregate equality oblivious commitment-based envelope protocol and fast access control vector broadcast group key management to reduce overhead. It also introduces a traitor tracing technique to identify any traitors in the two-layer encryption environment for cloud computing.
766 a secure-data-sharing-in-cloud-storage-with-independent-key-generation-ce...revathirram
This document summarizes a research paper that proposes a mediated certificateless public key encryption (mCL-PKE) scheme for secure data sharing in cloud storage. The key points are:
1) The mCL-PKE scheme solves problems of key escrow and certificate revocation without using computationally expensive bilinear pairing operations.
2) It uses a security mediator to instantly revoke compromised users and enforce access policies. The mediator also supports partial decryption to preserve data confidentiality.
3) The scheme extends mCL-PKE with an access control list to allow the data owner to encrypt data only once for multiple authorized users, improving efficiency over previous pairing-based schemes.
This document proposes a system for public auditing of data stored in the cloud while preserving privacy. It uses homomorphic linear authenticators with random masking to guarantee data privacy. A third party auditor is used to verify the integrity of outsourced data on demand without retrieving the entire dataset. The system aims to prevent data leakage and enhance security with mobile message alerts when unauthorized access is detected. It further improves auditing using a multicast batch RSA authentication scheme.
PUBLIC AUDITING FOR SECURE CLOUD STORAGE ...Bharath Nair
This document outlines a presentation on public auditing for secure cloud storage. It discusses the objective of developing a system to allow cloud users to ensure their data is secure and not corrupted. It covers topics like introduction to cloud computing, literature review on existing methods, problem description, the proposed method, applications, discussion of base paper, execution tools, and conclusions. The proposed method aims to enable public auditing of cloud storage without requiring local data copies, providing privacy and efficiency.
Secure Redundant Data Avoidance over Multi-Cloud Architecture. IJCERT JOURNAL
Redundant data avoidance systems, the Private Cloud are involved as a proxy to allow data owner/users to securely perform duplicate check with differential privileges. Such architecture is practical and has attracted much attention from researchers. The data owners only outsource their data storage by utilizing public cloud while the data operation is managed in private cloud, in this connection our presented system has follows traditional encryption while providing data confidentiality, is incompatible with redundant data avoidance. Identical data copies of different users will lead to different ciphertexts, making data avoidance impossible. To address above issues convergent encryption technique has been proposed to encrypt the data before outsourcing. To better protect data security, this paper makes the first attempt to formally address the problem of authorized redundant data avoidance. Different from traditional redundant data avoidance systems, the differential privileges of users are further considered in duplicate check besides the data itself. We also present several new redundant data avoidance constructions supporting authorized duplicate check in a multi-cloud architecture. Security analysis demonstrates that our scheme is secure in terms of the definitions specified in the proposed security model. In order to perform secure access controlling scheme user may satisfy fine-grained approach at cloud level towards access restricting from unauthorized users or adversaries.
Control cloud data access privilege and anonymity with fully anonymous attri...LeMeniz Infotech
Control cloud data access privilege and anonymity with fully anonymous attribute based encryption
Do Your Projects With Technology Experts
To Get this projects Call : 9566355386 / 99625 88976
Visit : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Audit free cloud storage via deniable attribute based encryptionMano Sriram
1) Cloud storage services have become popular, but user privacy is a concern as data owners do not want unauthorized access. Existing encryption schemes assume cloud providers are trusted, but they could be forced to reveal secrets.
2) The document proposes a new encryption scheme called deniable Ciphertext Policy Attribute Based Encryption (CP-ABE) that allows cloud providers to create fake user secrets, protecting real secrets even if the provider is coerced.
3) By using deniable CP-ABE, cloud providers can convince coercers that obtained secrets are genuine while actually protecting user privacy, addressing a key limitation of prior encryption schemes.
DECENTRALIZED ACCESS CONTROL OF DATA STORED IN CLOUD USING KEY POLICY ATTRIBU...Migrant Systems
This document proposes a decentralized access control method for data stored in the cloud using key policy attribute-based encryption (KP-ABE). It aims to allow fine-grained access control while maintaining data confidentiality and scaling efficiently. The method defines and implements access policies based on data attributes. It also allows the data owner to delegate access control tasks to cloud servers without revealing data contents. This is achieved using a combination of decentralized KP-ABE and a time-based file deletion scheme. The proposed approach is analyzed and shown to be highly secure and efficient.
A Privacy Preserving Attribute Based Access Control Mechanism In Distributed ...Editor IJCATR
We propose a new decentralized access control scheme for secure data storage in clouds that supports anonymous
authentication. In the proposed scheme, the cloud verifies the authenticity of the series without knowing the user’s identity before
storing data. Our scheme also has the added feature of access control in which only valid users are able to decrypt the stored
information. The scheme prevents replay attacks and supports creation, modification, and reading data stored in the cloud. We also
address user revocation. Moreover, our authentication and access control scheme is decentralized and robust, unlike other access
control schemes designed for clouds which are centralized. The communication, computation, and storage overheads are comparable
to centralized approaches.
The Recent Trend: Vigorous unidentified validation access control system with...IJERA Editor
Service Providers can grow their business by selling our cloud authentication service that can be fully branded
to the Service Provider or if required a Service. The proposed enhanced decentralized access control scheme for
secure data storage in clouds that supports anonymous authentication. In the proposed scheme, the cloud verifies
the authenticity of the series without knowing the user’s identity before storing data. The scheme also has the
added feature of access control in which only valid users are able to decrypt the stored information. The scheme
prevents replay attacks and supports creation, modification, and reading data stored in the cloud. It addresses
user revocation. Moreover, our authentication and access control scheme is decentralized and robust, unlike
other access control schemes designed for clouds which are centralized. The communication, hiding attributes,
increasing high security in access, computation, and storage overheads are comparable to centralized
approaches.
In Existing, it is based on ABE (attribute based encryption) technique which is a centralized approach, where a
single Key Distribution Centre (KDC) distributes secret keys and attributes to all users using asymmetric key
approach. We propose a new decentralized access control method for storing data by providing security in
clouds and also we hide the attributes and access rule of a user. The cloud validates the authentication of the
sequence without knowing the users characteristics previous to the data store. By using this approach only
certified users have right to use the suitable attributes. In future, time based file revocation scheme can be used
to assure the deletion of a file. When time limit of a file expires, we implement the policy based renewal of time
to that file.
Organize Cloud Data Access Privilege and Anonymity with Fully Nameless Attrib...rahulmonikasharma
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Secret keys and the packets transportation for privacy data forwarding method...eSAT Journals
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IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
CLOUD BASED ACCESS CONTROL MODEL FOR SELECTIVE ENCRYPTION OF DOCUMENTS WITH T...IJNSA Journal
Cloud computing refers to a type of networked computing whereby an application can be run on connected servers instead of local servers. Cloud can be used to store data, share resources and also to provide services. Technically, there is very little difference between public and private cloud architecture. However, the security and privacy of the data is a very big issue when sensitive data is being entrusted to third party cloud service providers. Thus encryption with a fine grained access control is inevitable to enforce security in clouds. Several techniques implementing attribute based encryption for fine grained access control have been proposed. Under such approaches, the key management overhead is a little bit high in terms of computational complexity. Also, secret sharing mechanisms have added complexity. Moreover, they lack mechanisms to handle existence of traitors. Our proposed approach addresses these requirements and reduces the overhead of the key management as well as secret sharing by using efficient algorithms and protocols. Also, a traitor tracing technique is introduced into the cloud computing two layer encryption environment.
A cloud storage system for sharing data securely with privacy preservation an...eSAT Journals
Abstract Cloud computing provides much-known services for storing user data over cloud server and it provides attention towards a broad set of technologies, rules and controls deployed to provide security for applications and data. As the more and more firm uses the cloud, security in cloud environment is becoming very important issue. It is much needed that companies should work with partners doing best practices of cloud security and which facilitate transparency for their solutions. Number of security solutions today depends on the authentication for security but it did not provide solution for the privacy problems while sharing data in the cloud environment. Data access request from the user itself may expose users’ private data no matter his request approved or not. So this becomes very important in sharing data in the cloud environment. In this paper we proposed a system which provides attention towards the above mentioned problem. In proposed system we used the concept of data anonymity for sending data access request to data owner and also provide the data auditing facility to detect fraud in the integrity of users shared data. Keywords: Cloud computing, privacy preservation, data integrity, data sharing, authentication
Security Check in Cloud Computing through Third Party Auditorijsrd.com
In cloud computing, data owners crowd their data on cloud servers and users (data consumers) can access the data from cloud servers. Due to the data outsourcing, however, it requires an independent auditing service to check the data integrity in the cloud. Some existing remote integrity checking method scan only serve for static records data. Thus, cannot be used in the auditing service since the data in the cloud can be animatedly updated. Thus, an efficient and secure dynamic auditing protocol is required to convince data owners that the data are correctly stored in the cloud. In this paper, we first design an auditing framework for cloud storage systems for privacy-preserving auditing protocol. Then, we extend our auditing protocol to support the data dynamic operations, which is efficient to secure the random model.
Augmenting Publish/Subscribe System by Identity Based Encryption (IBE) Techni...IJCERT JOURNAL
Security is one of the extensive and complicated requirements that need to be provided in order to achieve few issues like confidentiality, integrity and authentication. In a content-based publish/subscribe system, authentication is difficult to achieve since there exists no strong bonding between the end parties. Similarly, Integrity and confidentiality needs arise in published events and subscription conflicts with content-based routing. The basic tool to support confidentiality, integrity is encryption. In this paper for providing security mechanism in broker-less content-based publish/subscribe system we adapt pairing-based cryptography mechanism. In this mechanism, we use Identity Based Encryption (IBE) technique to achieve the needs of publish/subscribe system. This approach helps in providing fine-grained key management, effective encryption, decryption operations and routing is carried out in the order of subscribed attributes
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Improving Efficiency of Security in Multi-CloudIJTET Journal
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Attribute based encryption with privacy preserving in clouds
1. International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169
Volume: 2 Issue: 2 231 – 236
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231
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Attribute Based Encryption with Privacy Preserving In Clouds
M. Suriyapriya1
, A. Joicy2
PG Scholar1
Assistant Professor CSE Department2
St.Joseph College of Engineering
Sriperumbudur, Chennai-602105
suriyamathaiyan22@gmail.com, joylouis.90@gmail.com
Abstract— Security and privacy are very important issues in cloud computing. In existing system access control in clouds are centralized in
nature. The scheme uses a symmetric key approach and does not support authentication. Symmetric key algorithm uses same key for both
encryption and decryption. The authors take a centralized approach where a single key distribution center (KDC) distributes secret keys and
attributes to all users. A new decentralized access control scheme for secure data storage in clouds that supports anonymous authentication. The
validity of the user who stores the data is also verified. The proposed scheme is resilient to replay attacks. In this scheme using Secure Hash
algorithm for authentication purpose, SHA is the one of several cryptographic hash functions, most often used to verify that a file has been
unaltered. The Paillier crypto system, is a probabilistic asymmetric algorithm for public key cryptography. Pailier algorithm use for Creation of
access policy, file accessing and file restoring process.
Keywords—Access control, Authentication, Secure hash algorithm, pailler algorithm.
__________________________________________________*****_________________________________________________
I. INTRODUCTION
The mainstay of this is to propose a new decentralized
access control scheme for secure data storage in clouds that
supports anonymous authentication. The proposed scheme
is resilient to replay attacks. A writer whose attributes and
keys have been revoked cannot write back stale
information. Distributed access control of data stored in
cloud so that only authorized users with valid attributes can
access them. Authentication of users who store and modify
their data on the cloud. The identity of the user is protected
from the cloud during authentication. The architecture is
decentralized, meaning that there can be several KDCs for
key management. The access control and authentication are
both collusion resistant, meaning that no two users can
collude and access data or authenticate themselves, if they
are individually not authorized. Revoked users cannot
access data after they have been revoked. The proposed
scheme is resilient to replay attacks. A writer whose
attributes and keys have been revoked cannot write back
stale information. The protocol supports multiple read and
writes on the data stored in the cloud. The costs are
comparable to the existing centralized approaches, and the
expensive operations are mostly done by the cloud.
Proposing privacy preserving authenticated access control
scheme. According to our scheme a user can create a file
and store it securely in the cloud. This scheme consists of
use of the two protocols ABE and ABS. The cloud verifies
the authenticity of the user without knowing the user’s
identity before storing data. The scheme also has the added
feature of access control in which only valid users are able
to decrypt the stored information. The scheme prevents
replay attacks and supports creation, modification, and
reading data stored in the cloud.
II. RELATED WORK
ABE was proposed by Sahai and Waters [26]. In ABE,
a user has a set of attributes in addition to its unique ID.
There are two classes of ABEs. In Key-policy ABE or KP-
ABE (Goyal et al. [27]), the sender has an access policy to
encrypt data. A writer whose attributes and keys have been
revoked cannot write back stale information. The receiver
receives attributes and secret keys from the attribute
authority and is able to decrypt information if it has
matching attributes. In Cipher text-policy, CP-ABE ([28],
[29]), the receiver has the access policy in the form of a
tree, with attributes as leaves and monotonic access
structure with AND, OR and other threshold gates.
All the approaches take a centralized approach and
allow only one KDC, which is a single point of failure.
Chase [30] proposed a multi-authority ABE, in which there
are several KDC authorities (coordinated by a trusted
authority) which distribute attributes and secret keys to
users. Multi-authority ABE protocol was studied in [31],
[32], which required no trusted authority which requires
every user to have attributes from at all the KDCs.
Recently, Lewko and Waters [35] proposed a fully
2. International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169
Volume: 2 Issue: 2 231 – 236
______________________________________________________________________________________
232
IJRITCC | February 2014, Available @ http://www.ijritcc.org
_______________________________________________________________________________________
decentralized ABE where users could have zero or more
attributes from each authority and did not require a trusted
server. In all these cases, decryption at user’s end is
computation intensive. So, this technique might be
inefficient when users access using their mobile devices.
To get over this problem, Green et al. [33] proposed to
outsource the decryption task to a proxy server, so that the
user can compute with minimum resources (for example,
hand held devices). However, the presence of one proxy
and one key distribution center makes it less robust than
decentralized approaches. Both these approaches had no
way to authenticate users, anonymously. Yang et al. [34]
presented a modification of [33], authenticate users, who
want to remain anonymous while accessing the cloud.
To ensure anonymous user authentication Attribute
Based Signatures were introduced by Maji et al. [23]. This
was also a centralized approach. A recent scheme by the
same authors [24] takes a decentralized approach and
provides authentication without disclosing the identity of
the users. However, as mentioned earlier in the previous
section it is prone to replay attack.
III. PROPOSED WORK
The main contributions of this paper are the following:
Distributed access control of data stored in cloud so that
only authorized users with valid attributes can access
them.
The identity of the user is protected from the cloud
during authentication.
The architecture is decentralized, meaning that there can
be several KDCs for key management.
The access control and authentication are both collusion
resistant, meaning that no two users can collude and
access data or authenticate themselves, if they are
individually not authorized.
Revoked users cannot access data after they have been
revoked.
The proposed scheme is resilient to replay attacks. A
writer whose attributes and keys have been revoked
cannot write back stale information.
The protocol supports multiple read and write on the
data stored in the cloud.
The costs are comparable to the existing centralized
approaches, and the expensive operations are mostly
done by the cloud.
Fig 1: Secure Cloud storage model
Authentication of users who store and modify their data
on the cloud.
The identity of the user is protected from the cloud
during authentication.
The architecture is decentralized, meaning that there
can be several KDC’s for key management. There are three
users, a creator, a reader and writer. Creator Alice receives
a token γ from the trustee, who is assumed to be honest. A
trustee can be someone like the federal government who
manages social insurance numbers etc. On presenting her
id the trustee gives her a token γ.. For example, these can
be servers in different parts of the world. A creator on
presenting the token to one or more KDCs receives keys
for encryption/decryption and signing. In the Fig. 1, SKs
are secret keys given for decryption, Kx are keys for
signing. The message MSG is encrypted under the access
policy X. The access policy decides who can access the
data stored in the cloud. The creator decides on a claim
policy Y, to prove her authenticity and signs the message
3. International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169
Volume: 2 Issue: 2 231 – 236
______________________________________________________________________________________
233
IJRITCC | February 2014, Available @ http://www.ijritcc.org
_______________________________________________________________________________________
under this claim. The ciphertext C with signature is c, and
is sent to the cloud. The cloud verifies the signature and
stores the ciphertext C. When a reader wants to read, the
cloud sends C. If the user has attributes matching with
access policy, it can decrypt and get back original
message. Write proceeds in the same way as file creation.
By designating the verification process to the cloud, it
relieves the individual users from time consuming
verifications. When a reader wants to read some data stored
in the cloud, it tries to decrypt it using the secret keys it
receives from the KDCs. If it has enough attributes
matching with the access policy, then it decrypts the
information stored in the cloud.
A. Creation of KDC
Different number of KDC's are created and to register a
user details. KDC name, KDC id and KDC password are
given as input to create KDC. Inputs will save in a database
and to register a user details given a input as username and
user id.
Fig 2: Creation of KDC
B. KDC Authentication
After KDC given a user id to a user, the user will
enrolled the personal details to KDC's given a input as user
name, user id, password etc. The KDC will be verify the
user details and it will insert it in a Database.
Fig 3: KDC Authentication
C. Trustee and User Accessibility
Users can get the token from trustee for the file upload.
After trustee was issuing a token, trustee can view the logs.
User can login with their credentials and request the token
from trustee for the file upload using the user id. After the
user id received by the trustee, trustee will be create token
using user id, key and user signature (SHA).
Fig 4: User Accessibility
D. Creation of access policy
After the key was received by the User, the message
MSG is encrypted under the access policies. The access
policies decide who can access the data stored in the cloud.
The cipher text C with signature is c, and is sent to the
cloud. The cloud verifies the signature and stores the cipher
text C. When a reader wants to read, the cloud sends C. If
the user has attributes matching with access policy, it can
decrypt and get back original message and user can upload
the file after user get key from the KDC.
Fig 5: Creation of access policy
E. File accessing
Using their access policies the users can download their
files by the help of kdc’s to issue the private keys for the
particular users. After trustee token issuance for the users,
the users produce the token to the KDC then the token
verify by the KDC if it is valid then KDC will provide the
public and Private key to the user. After users received the
c
F
i
l
e
s
s
t
o
r
e
d
i
n
c
l
o
c
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keys the files are encrypt with the public keys and set their
Access policies (privileges).
Fig 6: File accessing
F. File Restoration
Files stored in cloud can be corrupted. So for this issue,
using the file recovery technique to recover the corrupted
file successfully and to hide the access policy and the user
attributes.
Fig 7: File Restoration
G. Secure Hash Algorithm
Definition: SHA-1 is one of several cryptographic hash
functions, most often used to verify that a file has been
unaltered. SHA is short for Secure Hash Algorithm.
File verification using SHA-1 is accomplished by
comparing the checksums created after running the
algorithm on the two files you want to compare. SHA-1 is
the second iteration of this cryptographic hash function,
replacing the previous SHA-0. An SHA-2 cryptographic
hash function is also available and SHA-3 is being
developed.
One iteration within the SHA-1 compression function.
A, B, C, D and E are 32bit words of the state. F is a
nonlinear function that varies. n denotes a left bit
rotation by n places. n varies for each operation. Wt is the
expanded message word of round t. Kt is the round
constant of round t. denotes addition modulo 232
.
Fig 8: Secure Hash Algorithm
H. Paillier Algorithm
The Paillier cryptosystem, named after and invented by
Pascal Paillier is a probabilistic asymmetric algorithm for
public key cryptography.
Key generation
Choose two large prime number p and q randomly and
independently of each other such that gcd (pq,(p-1)(q-
1))=1. This property is assured if both primes are of
equivalent length, i.e p,q {0,1 }s-1
for security parameter S
. Compute n=pq and λ=lcm(p-1,q-1).
Select random integer g where gZ*n
2
. Ensure n divides
the order of g by checking the existence of the
following modular multiplicative inverse .μ= (L(gλ
mod
n2
))-1
mod n, where function L is defind as The public
(encryption) key is (n,g).. The private (decryption) key
is (λ,μ ).
5. International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169
Volume: 2 Issue: 2 231 – 236
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Encryption
Let m be a message to be encrypted where m Zn. Select
random r where r Z*n. Compute cipher text as: c= gm
.rn
mod n2
Decryption
Cipher text: cZ*n
2.
Compute message: m =L(cλ
mod n2
). Μ
mod n
IV. CONCULSION
A decentralized access control technique with
anonymous authentication, which provides user revocation
and prevents replay attacks, is achieved. The cloud does
not know the identity of the user who stores information,
but only verifies the user’s credentials. Key distribution is
done in a decentralized way and also hide the attributes and
access policy of a user. One limitation is that the cloud
knows the access policy for each record stored in the cloud.
In future, using SQL queries for hide the attributes and
access policy of a user. Files stored in cloud can be
corrupted. So for this issue using the file recovery
technique to recover the corrupted file successfully and to
hide the access policy and the user attributes.
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