1 INTRODUCTION • Security Goals • Attacks • Services and Techniques 2 CONFIDENTIALITY • Symmetric-Key Ciphers • Asymmetric-Key Ciphers 3 OTHER ASPECTS OF SECURITY Part 1 => Cryptography and Network Security - Introduction => The OSI Security Architecture => Classical CryptoSystems => Classical Encryption Techniques => Linear Feedback Shift Register (LFSR) => Introduction to Number Theory => Finite Fields Part 2 => Simplified Data Encryption Standard (S-DES) => Block Cipher Principles => Multiple Encryption & DES => Modes of Operation 9) Define Steganography. In this section and the next, we examine a sampling of what might be called classical encryption techniques. A programming language is a formal constructed language designed to communicate instructions to a machine, particularly a computer. This Section covers below lists of topics. 6) Define possible types of attacks . 2) Difference between plaintext and cipher text. 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