Cryptographic Algorithms

A simple substitution cipher where each letter is shifted by a fixed number of positions.

A digraph substitution cipher that encrypts pairs of letters using a 5x5 key matrix.

A matrix-based cipher that uses linear algebra and modulo arithmetic.

A polyalphabetic substitution cipher that uses a repeating keyword.

A transposition cipher that writes text in a zigzag rail pattern.

An asymmetric cryptographic algorithm using public and private keys.

A key exchange method for generating a shared secret over an insecure channel.