Web services security
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Web Services Security (WS-Security) is a proposed standard that addresses securing data exchanged as part of a web service. It provides authentication, authorization, confidentiality, integrity, and non-repudiation. Security can be implemented at the transport level using SSL/TLS to secure the communication channel, or at the message level by securing the SOAP message itself using standards like XML Encryption, XML Signature, and WS-Security. Transport level security secures the connection, while message level security secures individual messages and allows security to travel with the message between applications and intermediaries.
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Vtu network security(10 ec832) unit 1 notes
UNIT - 1
Services, mechanisms and attacks, The OSI security architecture, A model for
network security.
TEXT BOOK:
1. Cryptography and Network Security, William Stalling, Pearson Education, 2003.
REFERENCE BOOKS:
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UNIT - 1
Services, mechanisms and attacks, The OSI security architecture, A model for network security. 6 Hrs
UNIT - 2
SYMMETRIC CIPHERS: Symmetric Cipher Model, Substitution Techniques, Transposition Techniques, Simplified DES, Data encryption standard (DES), The strength of DES, Differential and Linear Cryptanalysis, Block Cipher Design Principles and Modes of Operation, Evaluation Criteria for Advanced Encryption Standard, The AES Cipher. 7 Hrs
UNIT - 3
Principles of Public-Key Cryptosystems, The RSA algorithm, Key Management, Diffie - Hellman Key Exchange, Elliptic Curve Arithmetic, Authentication functions, Hash Functions. 6 Hrs
UNIT - 4
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UNIT - 5
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UNIT - 6
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UNIT - 7
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UNIT - 8
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This paper analyzes vulnerabilities of the SSL/TLS
Handshake
protocol
, which
is
responsible
for
authentication of
the parties in the
communication
and
negotiation of
security parameters
that
will be used
to protect
confidentiality and
integrity of the
data
. It
will
be
analyzed the
attacks
against the implementation of Handshake
protocol, as well as the
attacks against the other
elements
necessary to SSL/TLS protocol to discover security
flaws that were exploited, modes of
attack, the potential consequences, but also studyi
ng methods of defense
.
All versions of the
protocol are going to be the subject of the researc
h but
emphasis will be placed
on the critical
attack that
the most endanger the safety of data.
The goal of
the research
is
to point out the
danger of
existence
of at least
vulnerability
in the SSL/TLS protocol
, which
can be exploited
and
endanger the safety of
the data
that should be protected.
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This document discusses trust-based access control models for web services. It provides an overview of web services and security issues, then reviews existing access control models including role-based access control and attribute-based access control. It also discusses concepts of trust management and how trust is used in various trust-based web services access control models to determine whether to grant access to requesters based on their trust level. Finally, it examines how trust levels are calculated and how policies are represented in these trust-based models.
A Literature Review on Trust Management in Web Services Access Control
Web Service is a reusable component which has set of related functionalities that service requesters can programmatically access from the service provider and manipulate through the Web. One of the main security issue is to secure web services from the malicious requesters. Since trust plays an important role in many kinds of human communication, it allows people to work under insecurity and with the risk of negative cost, many researchers have proposed different trust based web services access control model to prevent malicious requesters. In this literature review, various existing trust based web services access control model have been studied also investigated how the concept of a trust level is used in the access control policy of a service provider to allow service requester to access the web services.
XML Encryption and Signature for Securing Web Services
In this research, we have focused on the most challenging issue that Web Services face, i.e. how to secure their information. Web Services security could be guaranteed by employing security standards, which is the main focus of this search. Every suggested model related to security design should put in the account the securities' objectives; integrity, confidentiality, non- repudiation, authentication, and authorization. The proposed model describes SOAP messages and the way to secure their contents. Due to the reason that SOAP message is the core of the exchanging information in Web Services, this research has developed a security model needed to ensure e-business security. The essence of our model depends on XML encryption and XML signature to encrypt and sign SOAP message. The proposed model looks forward to achieve a high speed of transaction and a strong level of security without jeopardizing the performance of transmission information.
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Web services security
- 1. Web Services Security BY: NURMEEN RAFIQUE ANIK MALIK FAKHAR-UL-ISLAM
- 2. WS-Security Definition WS-Security (Web Services Security) is a proposed IT industry standard that addresses security when data is exchanged as part of a Web service. Web Service Security Requirements The use of transport security to protect the communication channel between the Web service consumer and Web service provider. Message-level security to ensure confidentiality, integrity and authentication.
- 3. Web services security includes several aspects: Authentication—Verifying that the user is who she claims to be. A user's identity is verified based on the credentials presented by that user, such as: password, biometric information etc. Authorization (or Access Control)—Granting access to specific resources based on an authenticated user's entitlements. Entitlements are defined by one or several attributes. An attribute is the property or characteristic of a user. Confidentiality, privacy—Keeping information secret. Accesses a message, for example a Web service request or an email, as well as the identity of the sending and receiving parties in a confidential manner. Confidentiality and privacy can be achieved by encrypting the content of a message and obfuscating the sending and receiving parties' identities. Integrity, non repudiation—Making sure that a message remains unaltered during transit by having the sender digitally sign the message. A digital signature is used to validate the signature and provides non-repudiation. The timestamp in the signature prevents anyone from replaying this message after the expiration.
- 4. Web Services Security at Transport Level and Message Level Web Services currently revolves around three important protocols: SOAP, WSDL and UDDI. There are two ways with which we can ensure security with Web Services: Transport Level Security Message Level Security
- 5. Transport-level Security It secures the actual transport over which the message passes through from client to a service. Secure Socket Layer (SSL), otherwise known as Transport Layer Security (TLS), is the most widely used transport-level data-communication protocol providing: Authentication (the communication is established between two trusted parties). Confidentiality (the data exchanged is encrypted). Message integrity (the data is checked for possible corruption). Secure key exchange between client and server.
- 8. Message Level Security Message level security is an application layer service and facilitates the protection of message data between applications. It secures the message itself that is being transported from client to a service and vice versa. Application-level security is based on standards available for securing Web Services at XML level. Data confidentiality is implemented by XML Encryption. Data integrity and authenticity are implemented by XML Signature. Message structure and message security are implemented by SOAP and its security extension, WS-Security.
- 10. Differences TLS: In this model, a Web Service client will use SSL to open a secure socket to a Web Service. The client then sends and receives SOAP messages over this secured socket using HTTPS. MLS: In message level security, security information is contained within the SOAP message, which allows security information to travel along with the message.ge level security, security information is contained within the SOAP message, which allows security information to travel along with the message.
- 11. Differences cont’d TRANSPORT LEVEL MESSAGE LEVEL Uses SSL Dose not use SSL Point-to-Point: Protects the "pipe Data Chunks are protected Does not work with Intermediaries Intended to work with Intermediaries Ubiquitous Standards still under development