Introduction to cryptography with Java applets

A history of cryptography

Large integer computing

The integers

Linear diophantine equations and linear congruences

Linear diophantine equations and linear congruences

Linear ciphers

Systems of linear congruences - single modulus

Matrix ciphers

Systems of linear congruences - multiple moduli

Quadratic congruences

Quadratic ciphers

Primality testing

Factorization techniques

Exponential congruences

Exponential ciphers

Establishing keys and message exchange

Cryptographic applications