1 Lesson 21. 2 Internet Organization network Fire wall.

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Presentation transcript:

1 Lesson 21

2 Internet Organization network Fire wall

3 Proxy Server The Interne t Proxy server server Client Hub

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

5 Transposition I will not come today. Tell the boss. IWILL NOTCO METOD AY.TE LLTHE BOSS INMALBWOEYLOITT.TSLCOTHSLODEE

6 Cryptography Cryptography is a collection of mathematical techniques to ensure confidentiality of information Cryptography is a collection of mathematical techniques to ensure confidentiality of information Encryption and Decryption Encryption and Decryption The process of scrambling a message with the help of a key is called Encryption 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 The process of unscrambling a message using an appropriate key is called decryption Keys are numbers or characters that are randomly generated Keys are numbers or characters that are randomly generated Symmetric and Asymmetric cryptography Symmetric and Asymmetric cryptography Symmetric - same keys are used for encryption and decryption 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 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 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 means any letters numbers, symbols, images, characters or any combination thereof in electronic form applied to an electronic document An electronic signature ensures An electronic signature ensures Authenticity Authenticity Integrity Integrity Non- repudiation Non- repudiation