HP VPN Server Appliance sa3110/sa3150/sa3400/sa3450 - Virtual Private Networking Concepts Guide

Hewlett-Packard Company Virtual Private Networking Concepts Guide
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Cryptographic Systems and Encryption Terminology
Cryptographic Systems and Encryption TerminologyCryptographic Systems and Encryption Terminology
Cryptographic Systems and Encryption Terminology
Cryptographic Systems and Encryption Terminology Overview . . . . . . . . . . . . . . . . . 2-1
Symmetric Cryptographic Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
Data Encryption Standard (DES) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
Triple Pass DES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
3DES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
Outer Cipher Block Chaining (CBC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8
Asymmetric Cryptographic Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
Symmetric Vs. Asymmetric Cryptography. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10
Diffie-Hellman Session Key Exchange. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11
Key Space and Brute Force Attacks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-13