Network Security

Principle purpose of this lecture is to explain on Network Security. Here briefly explain on introduction to Cryptography, Substitution Ciphers, Transposition Ciphers, One-Time Pads and Two Fundamental Cryptographic Principles. This lecture also briefly describe on the Advanced Encryption Standard, Electronic Code Book Mode, Cipher Block Chaining Mode, Cipher Feedback Mode and Stream Cipher Mode. Finally discuss on Communication Security; IPsec, Firewalls, Virtual Private Networks and Wireless Security.