Classical Cryptography Simulator

Shift-based substitution cipher. Each letter is replaced by a letter a fixed number of positions down the alphabet.

Each letter maps to a unique substitute letter using a randomized alphabet mapping.

Digraph substitution cipher using a 5×5 key matrix. Encrypts pairs of letters.

Polygraphic substitution cipher using matrix multiplication. Encrypts character pairs using 2×2 key matrix.

Vigenère cipher using a repeating keyword to create multiple shift values. More secure than Caesar cipher.

Transposition cipher that writes plaintext in a zigzag pattern across multiple rails.

Rearranges plaintext by writing it in rows and reading columns in a key-specified order.

Conceptual demonstration of hiding secret messages within cover data.