Cryptography & Network Security – Classical & Block Ciphers: A model for Network Security, Classical encryption techniques: Symmetric cipher model, Substitution ciphers-Caesar Cipher, Monoalphabetic Cipher, Playfair Cipher, Hill Cipher, Polyalphabetic Ciphers, One time pad, Steganography. Block Ciphers and Data Encryption Standards: Traditional Block Cipher structures, Data Encryption Standard (DES), A DES Example, The strength of DES, Block cipher design principles.

Cryptography & Network Security – Public Key & PRNG: Pseudorandom number Generators: Linear Congruential Generators, Blum Blum Shub Generator. Public key cryptography and RSA: Principles of public key cryptosystems, applications, requirements, cryptanalysis, RSA algorithm and its security. Diffie-Hellman key exchange, key exchange protocols, man-in-the-middle attack, and Elliptic Curve Cryptography including key exchange and encryption/decryption.