Digital certificates and information security
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Digital certificates ensures secure transactions over internet. This presentation is about information security and secure online transactions through digital certificates. Courtesy: www.ifour-consultancy.com
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Digital certificates
This document discusses the history and uses of cryptography and digital certificates. It provides an overview of how public key infrastructure (PKI) uses public and private key pairs to securely exchange information over networks. A certification authority (CA) is responsible for issuing digital certificates which contain a public key and verify identity. PKI and digital certificates are used for applications like encryption, digital signatures, authentication, and secure communication protocols.
Introduction to Public Key Infrastructure
Adonis Fung and I worked on a project where we defined and built PKI (Public Key Infrastructure) for our local development and deployed environments. I gave a talk to our engineers on how PKI works, covering encryption, signing, trust stores, and how the HTTPS handshake works.
Digital certificates
Digital signatures use asymmetric cryptography to authenticate digital messages. They allow a recipient to verify the identity of the sender and confirm the message has not been altered. A digital signature scheme involves key generation, signing, and verification algorithms. Digital signatures provide authentication, integrity, and non-repudiation and are commonly used for software distribution, financial transactions, and other cases requiring detection of forgery or tampering. They offer advantages over traditional ink signatures like inability to forge or erase the signature.
Digital certificates
Digital certificates certify the identity of individuals, institutions, or devices seeking access to information online. They are issued by a Certification Authority which verifies the identity of the certificate holder and embeds their public key and information into the certificate. Digital certificates allow for secure online transactions by providing identity verification, non-repudiation of transactions, encryption of communications, and single sign-on access to systems. They are commonly used in applications that require authentication and encryption like SSL, S/MIME, SET, and IPSec.
Digital signature
Digital signatures provide authentication, integrity, and non-repudiation for digital documents and messages. They work by using public key cryptography where a private key is used to sign a message hash and the corresponding public key can then verify that the signature is valid. Digital signatures are important for electronic transactions and communications where the identity of the sender and the integrity of the message need to be assured. However, digital signatures are only as secure as the private keys used to create them.
Digital certificates & its importance
A digital certificate is a unique electronic document that identifies an individual or organization. It uses public key infrastructure (PKI) to allow secure data exchange over the internet. A digital certificate contains a public key and is digitally signed by a certificate authority (CA) that verifies the identity of the requester. When user A sends a message to user B, user B can verify user A's certificate by checking the CA's digital signature on the certificate using the CA's public key. Digital certificates are important for secure communication, online banking, expanding e-commerce, and protecting against online threats. The major types are SSL certificates for servers, code signing certificates for software, and client certificates for identifying individuals.
Public key infrastructure
A public key infrastructure (PKI) allows for secure communication and data exchange over public networks through the use of public and private cryptographic key pairs provided by a certificate authority. A PKI uses asymmetric encryption where a public key is used to encrypt data and a private key is used to decrypt it. Digital certificates issued by a certificate authority are used to verify the identity of individuals by containing their public key and identification details signed by the certificate authority. This allows for trust in electronic transactions by ensuring people receive keys from the actual identity they claim to be rather than an impersonator.
public key infrastructure
This document summarizes a seminar presentation on public key infrastructure (PKI). It discusses key concepts of PKI including digital signatures, certificates, validation, revocation, and the roles of certification authorities. The presentation covers how asymmetric encryption, hashing, and digital signatures enable secure authentication and authorization in a PKI. It also examines the entities, operations, and technologies involved in implementing and managing a PKI, such as certificate authorities, registration authorities, key generation and storage, and certification revocation lists.
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Digital certificates
This document discusses the history and uses of cryptography and digital certificates. It provides an overview of how public key infrastructure (PKI) uses public and private key pairs to securely exchange information over networks. A certification authority (CA) is responsible for issuing digital certificates which contain a public key and verify identity. PKI and digital certificates are used for applications like encryption, digital signatures, authentication, and secure communication protocols.
Introduction to Public Key Infrastructure
Adonis Fung and I worked on a project where we defined and built PKI (Public Key Infrastructure) for our local development and deployed environments. I gave a talk to our engineers on how PKI works, covering encryption, signing, trust stores, and how the HTTPS handshake works.
Digital certificates
Digital signatures use asymmetric cryptography to authenticate digital messages. They allow a recipient to verify the identity of the sender and confirm the message has not been altered. A digital signature scheme involves key generation, signing, and verification algorithms. Digital signatures provide authentication, integrity, and non-repudiation and are commonly used for software distribution, financial transactions, and other cases requiring detection of forgery or tampering. They offer advantages over traditional ink signatures like inability to forge or erase the signature.
Digital certificates
Digital certificates certify the identity of individuals, institutions, or devices seeking access to information online. They are issued by a Certification Authority which verifies the identity of the certificate holder and embeds their public key and information into the certificate. Digital certificates allow for secure online transactions by providing identity verification, non-repudiation of transactions, encryption of communications, and single sign-on access to systems. They are commonly used in applications that require authentication and encryption like SSL, S/MIME, SET, and IPSec.
Digital signature
Digital signatures provide authentication, integrity, and non-repudiation for digital documents and messages. They work by using public key cryptography where a private key is used to sign a message hash and the corresponding public key can then verify that the signature is valid. Digital signatures are important for electronic transactions and communications where the identity of the sender and the integrity of the message need to be assured. However, digital signatures are only as secure as the private keys used to create them.
Digital certificates & its importance
A digital certificate is a unique electronic document that identifies an individual or organization. It uses public key infrastructure (PKI) to allow secure data exchange over the internet. A digital certificate contains a public key and is digitally signed by a certificate authority (CA) that verifies the identity of the requester. When user A sends a message to user B, user B can verify user A's certificate by checking the CA's digital signature on the certificate using the CA's public key. Digital certificates are important for secure communication, online banking, expanding e-commerce, and protecting against online threats. The major types are SSL certificates for servers, code signing certificates for software, and client certificates for identifying individuals.
Public key infrastructure
A public key infrastructure (PKI) allows for secure communication and data exchange over public networks through the use of public and private cryptographic key pairs provided by a certificate authority. A PKI uses asymmetric encryption where a public key is used to encrypt data and a private key is used to decrypt it. Digital certificates issued by a certificate authority are used to verify the identity of individuals by containing their public key and identification details signed by the certificate authority. This allows for trust in electronic transactions by ensuring people receive keys from the actual identity they claim to be rather than an impersonator.
public key infrastructure
This document summarizes a seminar presentation on public key infrastructure (PKI). It discusses key concepts of PKI including digital signatures, certificates, validation, revocation, and the roles of certification authorities. The presentation covers how asymmetric encryption, hashing, and digital signatures enable secure authentication and authorization in a PKI. It also examines the entities, operations, and technologies involved in implementing and managing a PKI, such as certificate authorities, registration authorities, key generation and storage, and certification revocation lists.
Presentation on digital signatures & digital certificates
Digital signatures and digital certificates use public key cryptography to authenticate users and verify the integrity of digital documents. A digital signature is created by encrypting a document with a user's private key. Anyone can then decrypt the signature using the signer's public key to verify that the document came from the correct user and has not been altered. Digital certificates contain a user's public key and identification information, and are digitally signed by a Certificate Authority to validate the certificate. Common uses of digital signatures and certificates include encrypting messages, authenticating users, and facilitating secure online transactions.
SSL
The document discusses Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols for securing communications over a network. It explains that SSL uses certificates and keys to encrypt data between a client and server so only they can access it. It then describes the different versions of SSL, how SSL establishes encrypted connections, and provides diagrams of SSL and mutual authentication processes.
Digital signature & certificate
This document summarizes key aspects of digital signatures and encryption. It explains that digital signatures use public/private key pairs to encrypt messages for authentication, integrity and non-repudiation. A certificate authority acts as a trusted third party by issuing digital certificates that contain a user's public key and identity information signed with the CA's private key. The document also compares features of paper signatures to digital signatures.
Digital Signature
Digital signatures provide authentication and integrity for electronic documents and transactions. They use public key cryptography where a document is encrypted with the sender's private key and decrypted by the recipient's public key. A digital certificate issued by a certificate authority binds the signer's identity to their public key and is verified using the CA's digital signature. Common uses of digital signatures include software updates, financial transactions, and legally binding documents.
Digital Certificate
Digital certificates are used for security and verification purposes when sending electronic messages. A sender applies for a digital certificate from a Certificate Authority containing their public key and identification. The recipient can then use the CA's public key to decode the attached certificate and verify the sender's identity and public key to encrypt a reply message.
Introduction to Cryptography
The presentation covers the following:
Basic Terms
Cryptography
The General Goals of Cryptography
Common Types of Attacks
Substitution Ciphers
Transposition Cipher
Steganography- “Concealed Writing”
Symmetric Secret Key Encryption
Types of Symmetric Algorithms
Common Symmetric Algorithms
Asymmetric Secret Key Encryption
Common Asymmetric Algorithms
Public Key Cryptography
Hashing Techniques
Hashing Algorithms
Digital Signatures
Transport Layer Security
Public key infrastructure (PKI)
Digital signatures
Digital signatures provide authenticity, integrity, and non-repudiation for electronic documents and allow for secure e-governance and e-commerce using the internet. A digital signature is created using a private key to sign a message, and the signature can be verified using the corresponding public key. Digital signatures employ asymmetric cryptography and consist of key generation, signing, and verification algorithms. Hardware tokens like smart cards and USB tokens securely store private keys to generate digital signatures on documents. The Controller of Certifying Authorities licenses and regulates certification authorities in India to issue digital signature certificates.
Digital signature
Digital Signature, Electronic Signature, How digital signature works, Confidentiality of digital signature, Authenticity of digital signature, Integrity of digital signature, standard of digital signature, Algorithm of digital signature, Mathematical base of digital signature, parameters of digital signature, key computation of digital signature, key generation of digital signature, verification of of digital signature
cryptography
Cryptography is the practice of securing communications through techniques like encryption and decryption. It involves constructing algorithms to protect information from adversaries and ensure data confidentiality, integrity, and authentication. The main types are transposition ciphers, which rearrange letters, and substitution ciphers, which replace letters. Modern cryptography expanded with computers to encrypt any data and uses symmetric key cryptography, where senders and receivers share a key, and public key cryptography, where they have different keys. It has many applications including ATMs, email, remote access, and smart cards.
Digital signatures
A digital signature is a mathematical scheme for demonstrating the authenticity of a digital message or document. A valid digital signature gives a recipient reason to believe that the message was created by a known sender, such that the sender cannot deny having sent the message (authentication and non-repudiation) and that the message was not altered in transit (integrity). Digital signatures are commonly used for software distribution, financial transactions, and in other cases where it is important to detect forgery or tampering.
Digital signatures are often used to implement electronic signatures, a broader term that refers to any electronic data that carries the intent of a signature, but not all electronic signatures use digital signatures. In some countries, including the United States, India, and members of the European Union, electronic signatures have legal significance.
Impact of digital certificate in network security
This document discusses digital certificates, including an overview of what they are, their current uses, benefits, and barriers to implementation. Digital certificates use public key infrastructure to securely exchange information online by establishing identity. They are commonly used for secure communication, online banking, e-commerce, and preventing threats. Potential benefits include minimal user involvement, no extra hardware needs, and easy management, while barriers include financial costs and technological challenges. Future trends may help digital certificates overcome current barriers.
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This document discusses secure communication in network systems. It defines network security as activities that protect a network's usability, reliability, integrity and safety. Secure communication ensures confidentiality by encrypting messages so only the recipient can understand them, authentication to verify identities, and message integrity to ensure messages are not altered. It discusses how authentication can be based on what users know (passwords), have (tokens, cards) or are (biometrics). MACs (message authentication codes) using hash functions with a secret key also ensure message integrity and non-repudiation. The document outlines some principles of implementing network security like layering, limiting access, obscurity and simplicity.
Digital Signature
Digital signatures provide authenticity, integrity and non-repudiation to electronic documents by using public key infrastructure. Under PKI, each individual has a public/private key pair, and certification authorities verify and certify individuals' public keys. Digital signatures are generated by encrypting a document hash with an individual's private key and can be verified by decrypting with the corresponding public key.
Digital signature
Digital signatures use asymmetric cryptography to provide authentication, integrity and non-repudiation for electronic documents and communications. A digital signature is created using a private key and can be verified by anyone using the corresponding public key. This ensures the document was not altered and the sender cannot deny sending it. Private keys are protected using devices like smart cards or hardware tokens to keep them secure.
SSL And TLS
SSL and TLS provide end-to-end security for applications using TCP. They operate at the transport layer and provide services like data encryption, message integrity, and client/server authentication. The key components are the handshake protocol for negotiating encryption parameters and exchanging keys, the record protocol for fragmenting and encrypting application data, and alert and change cipher spec protocols for signaling errors and key changes. Common algorithms include RSA and Diffie-Hellman for key exchange, RC4, 3DES and AES for encryption, and MD5 or SHA for hashing. Sessions define a connection's cryptographic settings while connections are the actual data streams.
Digital signature
The document discusses digital signatures, including how they work, their history, applications, and legal status in India. A digital signature uses public and private keys to authenticate a message sender's identity and verify that the message was not altered. It explains how digital signature certificates are issued by certified authorities and associate an individual's identity with their public and private keys. The document also addresses frequently asked questions about digital signatures, such as how they provide security, who issues them, how long they are valid for, and their legal standing.
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Presentation on digital signatures & digital certificates
Digital signatures and digital certificates use public key cryptography to authenticate users and verify the integrity of digital documents. A digital signature is created by encrypting a document with a user's private key. Anyone can then decrypt the signature using the signer's public key to verify that the document came from the correct user and has not been altered. Digital certificates contain a user's public key and identification information, and are digitally signed by a Certificate Authority to validate the certificate. Common uses of digital signatures and certificates include encrypting messages, authenticating users, and facilitating secure online transactions.
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The document discusses Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols for securing communications over a network. It explains that SSL uses certificates and keys to encrypt data between a client and server so only they can access it. It then describes the different versions of SSL, how SSL establishes encrypted connections, and provides diagrams of SSL and mutual authentication processes.
Digital signature & certificate
This document summarizes key aspects of digital signatures and encryption. It explains that digital signatures use public/private key pairs to encrypt messages for authentication, integrity and non-repudiation. A certificate authority acts as a trusted third party by issuing digital certificates that contain a user's public key and identity information signed with the CA's private key. The document also compares features of paper signatures to digital signatures.
Digital Signature
Digital signatures provide authentication and integrity for electronic documents and transactions. They use public key cryptography where a document is encrypted with the sender's private key and decrypted by the recipient's public key. A digital certificate issued by a certificate authority binds the signer's identity to their public key and is verified using the CA's digital signature. Common uses of digital signatures include software updates, financial transactions, and legally binding documents.
Digital Certificate
Digital certificates are used for security and verification purposes when sending electronic messages. A sender applies for a digital certificate from a Certificate Authority containing their public key and identification. The recipient can then use the CA's public key to decode the attached certificate and verify the sender's identity and public key to encrypt a reply message.
Introduction to Cryptography
The presentation covers the following:
Basic Terms
Cryptography
The General Goals of Cryptography
Common Types of Attacks
Substitution Ciphers
Transposition Cipher
Steganography- “Concealed Writing”
Symmetric Secret Key Encryption
Types of Symmetric Algorithms
Common Symmetric Algorithms
Asymmetric Secret Key Encryption
Common Asymmetric Algorithms
Public Key Cryptography
Hashing Techniques
Hashing Algorithms
Digital Signatures
Transport Layer Security
Public key infrastructure (PKI)
Digital signatures
Digital signatures provide authenticity, integrity, and non-repudiation for electronic documents and allow for secure e-governance and e-commerce using the internet. A digital signature is created using a private key to sign a message, and the signature can be verified using the corresponding public key. Digital signatures employ asymmetric cryptography and consist of key generation, signing, and verification algorithms. Hardware tokens like smart cards and USB tokens securely store private keys to generate digital signatures on documents. The Controller of Certifying Authorities licenses and regulates certification authorities in India to issue digital signature certificates.
Digital signature
Digital Signature, Electronic Signature, How digital signature works, Confidentiality of digital signature, Authenticity of digital signature, Integrity of digital signature, standard of digital signature, Algorithm of digital signature, Mathematical base of digital signature, parameters of digital signature, key computation of digital signature, key generation of digital signature, verification of of digital signature
cryptography
Cryptography is the practice of securing communications through techniques like encryption and decryption. It involves constructing algorithms to protect information from adversaries and ensure data confidentiality, integrity, and authentication. The main types are transposition ciphers, which rearrange letters, and substitution ciphers, which replace letters. Modern cryptography expanded with computers to encrypt any data and uses symmetric key cryptography, where senders and receivers share a key, and public key cryptography, where they have different keys. It has many applications including ATMs, email, remote access, and smart cards.
Digital signatures
A digital signature is a mathematical scheme for demonstrating the authenticity of a digital message or document. A valid digital signature gives a recipient reason to believe that the message was created by a known sender, such that the sender cannot deny having sent the message (authentication and non-repudiation) and that the message was not altered in transit (integrity). Digital signatures are commonly used for software distribution, financial transactions, and in other cases where it is important to detect forgery or tampering.
Digital signatures are often used to implement electronic signatures, a broader term that refers to any electronic data that carries the intent of a signature, but not all electronic signatures use digital signatures. In some countries, including the United States, India, and members of the European Union, electronic signatures have legal significance.
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This document discusses digital certificates, including an overview of what they are, their current uses, benefits, and barriers to implementation. Digital certificates use public key infrastructure to securely exchange information online by establishing identity. They are commonly used for secure communication, online banking, e-commerce, and preventing threats. Potential benefits include minimal user involvement, no extra hardware needs, and easy management, while barriers include financial costs and technological challenges. Future trends may help digital certificates overcome current barriers.
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This document discusses secure communication in network systems. It defines network security as activities that protect a network's usability, reliability, integrity and safety. Secure communication ensures confidentiality by encrypting messages so only the recipient can understand them, authentication to verify identities, and message integrity to ensure messages are not altered. It discusses how authentication can be based on what users know (passwords), have (tokens, cards) or are (biometrics). MACs (message authentication codes) using hash functions with a secret key also ensure message integrity and non-repudiation. The document outlines some principles of implementing network security like layering, limiting access, obscurity and simplicity.
Digital Signature
Digital signatures provide authenticity, integrity and non-repudiation to electronic documents by using public key infrastructure. Under PKI, each individual has a public/private key pair, and certification authorities verify and certify individuals' public keys. Digital signatures are generated by encrypting a document hash with an individual's private key and can be verified by decrypting with the corresponding public key.
Digital signature
Digital signatures use asymmetric cryptography to provide authentication, integrity and non-repudiation for electronic documents and communications. A digital signature is created using a private key and can be verified by anyone using the corresponding public key. This ensures the document was not altered and the sender cannot deny sending it. Private keys are protected using devices like smart cards or hardware tokens to keep them secure.
SSL And TLS
SSL and TLS provide end-to-end security for applications using TCP. They operate at the transport layer and provide services like data encryption, message integrity, and client/server authentication. The key components are the handshake protocol for negotiating encryption parameters and exchanging keys, the record protocol for fragmenting and encrypting application data, and alert and change cipher spec protocols for signaling errors and key changes. Common algorithms include RSA and Diffie-Hellman for key exchange, RC4, 3DES and AES for encryption, and MD5 or SHA for hashing. Sessions define a connection's cryptographic settings while connections are the actual data streams.
Digital signature
The document discusses digital signatures, including how they work, their history, applications, and legal status in India. A digital signature uses public and private keys to authenticate a message sender's identity and verify that the message was not altered. It explains how digital signature certificates are issued by certified authorities and associate an individual's identity with their public and private keys. The document also addresses frequently asked questions about digital signatures, such as how they provide security, who issues them, how long they are valid for, and their legal standing.
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The document provides an overview of digital signatures, including their history, theory, workings, and importance. Digital signatures were first proposed in 1976 and use public key cryptography to validate the authenticity and integrity of electronic documents and messages. They work by encrypting a hash of the message with the sender's private key, which can later be decrypted and verified by the recipient using the sender's public key. This allows the recipient to confirm the message has not been tampered with and was signed by the proper sender. Digital signatures provide security benefits like non-repudiation and are legally recognized in many countries and applications.
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#MoreCrypto : Introduction to TLS
TLS provides confidentiality, identity, and integrity for internet communication. It is used for HTTPS web pages and applications on computers and phones. TLS is based on SSL and uses asymmetric encryption where the server sends a public key to set up the secure connection. The client then challenges the server, which responds using its private key to prove its identity. Certificates bind a public key to an identity and are signed by a Certification Authority. They contain information like the key, owner identity, and validity period.
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Blockchain PoC For Education
This case study will examine an implementation strategy to record degrees and certificates onto the Blockchain for authenticity and verification purposes.
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The document discusses the technical details of direct trust infrastructure, which is built on public key infrastructure (PKI). PKI uses public and private key cryptography, digital certificates, encryption, and digital signatures to enable authentication, secure messaging, electronic signatures, and data encryption. It describes how certificates bind a public key to identity information and are issued by a certification authority (CA) with the help of a registration authority (RA) that verifies identity documentation.
I would appreciate help with these 4 questions. Thank You.1) Expla.pdf
I would appreciate help with these 4 questions. Thank You.
1) Explain what the following are: root certificates, self-signed certificates. Describe how they
are used. Provide some examples of each explaining how they are used. You should be able to
find examples of each on your system by looking through various options available on your
browser.
2) Provide a listing of the fields associated with a certificate of your choosing. Use the X509
definition to match the general fields of a certificate with the certificate you choose to look at.
Describe each field.
3) Your manager is considering implementing a PKI infrastructure. They are considering using
RSA encryption technology for the central part of their infrastructure. You manager would like
to know some products or services that utilize RSA encryption technology. Provide three
examples and explain how they make use of the RSA encryption technology. Provide a few
original sentences describing each of your examples.
4) Compare the functionality offered by the RSA and Diffie-Hellman algorithms.
Solution
A Root SSL certificate could be a certificate issued by a trusty certificate authority (CA).In the
SSL system, anyone will generate a language key and sign a replacement certificate therewith
signature. However, that certificate isn\'t thought-about valid unless it\'s been directly or
indirectly signed by a trusty CA.A trusty certificate authority is Associate in Nursing entity that
has been entitled to verify that somebody is effectively World Health Organization it declares to
be. so as for this model to figure, all the participants on the sport should agree on a group of CA
that they trust. All operational systems and most of net browsers ship with a group of trusty
CAs.The SSL system is predicated on a model of trust relationship, conjointly known as “chain
of trust”. once a tool validates a certificate, it compares the certificate establishment with the list
of trusty CAs. If a match isn\'t found, the shopper can then check to check if the certificate of the
supplying CA was issued by a trusty CA, so on till the tip of the certificate chain. the highest of
the chain, the basis certificate, should be issued by a trusty Certificate Authority.
Self-signed certificates or certificates issued by a non-public CAs aren\'t appropriate to be used
with the overall public.A certificate serves two essential purpose distribute the public key and
verifying the individuality of the server so guests know they aren’t sending their information to
the wrong person. It can only properly verify the identity of the server when it is signed by a
trusted third party because any attacker can create a self-signed certificate and launch a man-in-
the-middle attack. If a user just accept a self-signed certificate, an attacker could drop on all the
traffic or try to set up an imitation server to phish additional information out of the user. Because
of this, you will approximately on no account want to use a self signe.
Dapp
CertiDApp is an open-source certificate issuing platform powered by blockchain that allows organizations to securely issue certificates in bulk for free. It utilizes cryptography and blockchain immutability to transparently verify certificates. CertiDApp offers features such as customization, digital signing, decentralized storage, and easy verification. CertiDApp aims to provide an efficient and secure way for organizations to issue digital certificates on the blockchain network.
TOP FEATURES OF CertiDApp
Ever heard of a platform where you can get multiple utility platforms at one place? Or a platform which gives an option where you do transactions in a complete peer to peer mode, no third party involve? Yes, OneDAAP is decentralized place where you can do numerous things.
Https
HTTPS combines HTTP with SSL/TLS to provide encryption and secure identification of the server. SSL/TLS uses public/private key encryption and digital certificates to provide data encryption and ensure the server is who it claims to be. During the SSL/TLS handshake, the server sends its certificate to the client, which verifies the certificate with a Certificate Authority's public key to establish an encrypted and authenticated connection.
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Digital certificates and information security
- 2. Introduction What is cryptography? The art of secret writing • Cryptosystems • keys
- 3. Problem Problem: How does Alice know that the public key she received is really Bob’s public key?
- 4. Digital Certificate • Electronic counterparts to driver licenses, passports • Prove your identity or right to access information or services online • Bind an identity to a pair of electronic keys • Provide a more complete security solution • Role of Certification Authority (CA)
- 5. Digital Certificates • Structure of Digital Certificate – Owner's public key – Owner's name – Expiration date of the public key – Name of the issuer (the CA that issued the Digital Certificate) – Serial number of the Digital Certificate – Digital signature of the issuer • Defined by CCITT X.509 international standard
- 6. Digital Certificates • Provide support for public key cryptography (PKC) • Digital certificates contain the public key of the entity • It rely on PKC for their own authentication • Used on handheld devices, mobile phones, on portable cards, smart cards
- 7. public key infrastructure (PKI) A public key infrastructure (PKI) consists of the components necessary to securely distribute public keys It consists of: – Certificates – Certificate authorities (CAs) – A repository for retrieving certificates – A method for revoking certificates – A method of evaluating a chain of certificates
- 8. Public Key Infrastructures (PKIs) • To use public key methods, an organization must establish a comprehensive Public Key Infrastructure (PKI) – A PKI automates most aspects of using public key encryption and authentication – Uses a PKI Server
- 9. Public Key Infrastructures (PKIs) • PKI Server Creates Public Key-Private Key Pairs – Distributes private keys to applicants securely – Often, private keys are embedded in delivered software PKI Server Private Key
- 10. Public Key Infrastructures (PKIs) • PKI Server Provides Certificate Revocation list (CRL) Checks – Distributes digital certificates to verifiers – Checks certificate revocation list before sending digital certificates PKI Server Digital Certificate
- 11. Public Key Infrastructures (PKIs) • CRL Checks – If applicant gives verifier a digital certificate, – The verifier must check the certificate revocation list PKI Server OK? OK or Revoked CRL
- 12. Generating the digital certificate
- 13. Digital Certificate : Example
- 14. Use of Digital Certificates • Electronic transactions – E-mail – Electronic commerce – Groupware – Electronic funds transfers • Netscape's Enterprise Server
- 15. Message Encryption Message Decryption Use of Digital Certificates
- 16. Need of Digital Certificates • Proper Privacy and Security • Trust • Special safeguards • Assuring the identity of all parties • To provide legitimate content
- 17. Digital Certificate Services • Services – Issuing – Revocation – Status services • Types of Digital Certificates – Server – Developer (For softwares) – personal
- 18. Digital Signature • Function as hand written signature electronically • Non repudiated • Enable "authentication" of digital messages
- 19. DC used for Digital signature and Encryption
- 20. DC used for Digital signature and Decryption