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Lesson 21

Lesson 21. Internet. Fire wall. Organization network. Proxy Server. server. Client. Client. The Internet. Hub. Proxy server. Client. Client. Computer Emergency Response Team (CERT) Systems Administrator, Audit, Network and Security Institute (SANS Institute). Transposition.

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Lesson 21

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  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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