Basic Encryption and Decryption

This is a complet guide about encryption and decrytion data, free pdf tutorial in 37 pages for beginner's by H. Lee Kwang .

Table of contents

• Concepts of encryption
• Cryptanalysis: how encryption systems are “broken”
• Terminology and Background
• Notations
• Plaintext vs. Ciphertext
• Basic operations
• Cryptography
• Breakable encryption
• Cryptanalysis
• Cryptology
• Representation of Characters
• Encoding
• Monoalphabetic Ciphers(Substitution)
• Simple substitution
• The Caesar Cipher
• Other Monoalphabetic Substitutions
• Polyalphabetic Substitution Ciphers
• Cryptanalysis of Polyalphabetic Substitutions