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Understanding Cryptography and Digital Signatures

Cryptography ensures information confidentiality through encryption and decryption techniques. Learn about symmetric, asymmetric cryptography, and digital signatures for authenticity, integrity, and non-repudiation.

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Understanding Cryptography and Digital Signatures

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Presentation Transcript

  1. Lesson 21

  2. Internet Fire wall Organization network

  3. Proxy Server server Client Client The Internet Hub Proxy server Client Client

  4. Computer Emergency Response Team (CERT) • Systems Administrator, Audit, Network and Security Institute (SANS Institute)

  5. Transposition I will not come today. Tell the boss. INMALBWOEYLOITT.TSLCOTHSLODEE

  6. Cryptography • Cryptography is a collection of mathematical techniques to ensure confidentiality of information • Encryption and Decryption • The process of scrambling a message with the help of a key is called Encryption • The process of unscrambling a message using an appropriate key is called decryption • Keys are numbers or characters that are randomly generated • Symmetric and Asymmetric cryptography • Symmetric - same keys are used for encryption and decryption • Asymmetric or Public Key Cryptography – a pair of public key and private key is used for encryption and decryption • Pretty Good Privacy (PGP) is a popular cryptographic system

  7. Digital/Electronic Signatures • An electronic signature means any letters numbers, symbols, images, characters or any combination thereof in electronic form applied to an electronic document • An electronic signature ensures • Authenticity • Integrity • Non- repudiation

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