Some terms we need to know

Early Crypto Systems

Substitution Ciphers

Extended Atbash

Alberti Cipher

Wheatstone Playfair Cipher

Block Rotate Cipher

Columnar Transposition

Transposition Ciphers

Improving Security

Vigenère Cipher

One Time Pad

Modular Arithmetic

Affine Cipher

Modular Arithmetic (2)

Linear Feedback Shift Register (LFSR)

Pseudo Random Number Generators - Blum Blum Shub

Modern Cryptology Basic Concepts

Block and Stream Ciphers

Block Cipher Modes of Operations