Cipher Guide: learn and test classic ciphers

Classical Ciphers Guide

Explore and try classic methods like Caesar, Vigenère, Playfair and more — with interactive tools.

Try Caesar Cipher Try Vigenère

Caesar Cipher

Simple substitution with a fixed alphabet shift.

Substitution Level: Easy
Open tool

Vigenère Cipher

Polyalphabetic substitution driven by a key.

Substitution Level: Medium
Open tool

Playfair Cipher

Digraph substitution using a 5×5 matrix derived from a keyword.

Substitution (digraphs) Level: Medium
Open tool

Rail Fence Cipher

Zigzag transposition across multiple rails.

Transposition Level: Easy
Open tool

Affine Cipher

Linear modular transform: E(x)=a·x+b (mod 26).

Substitution Level: Medium
Open tool

Columnar Transposition

Columnar reordering using a keyword sort.

Transposition Level: Medium
Open tool

How to start

  1. Pick a method (Caesar, Vigenère, etc.).
  2. Enter your text and set the key/shift.
  3. Try encrypt/decrypt and copy the result.