The Chamber’s tools

Classical ciphers

• A→D Caesar cipher online Encode and decode the Caesar cipher and ROT13, try every shift at once and spot the one that reads.
• A↔Z Atbash cipher Atbash: the alphabet read backwards. Works for Latin and Cyrillic.
• K→Q Substitution cipher Keyword or custom-alphabet substitution: encode, decode and crack letter by letter.
• ax+b Affine cipher The affine cipher E(x) = a·x + b: encode, decode and brute-force every key.
• KEY Vigenère cipher: encoder and cracker Vigenère and Beaufort: encode with a key, or crack without one — key length from the index of coincidence.
• ▦ Playfair cipher Playfair: the 5×5 key square and digraph encryption with each rule highlighted.
• 11 12 Polybius square and tap code The Polybius square: letters to digit pairs and back, the prisoners’ tap code and ADFGX.
• ⊔⊐ Pigpen cipher The Freemasons’ pigpen cipher: letters in grids and crosses. Type text or decode by clicking symbols.
• /\/\ Rail fence cipher The rail fence: text zigzags across rails. See each letter land, and brute-force the rail count.
• ▥ Columnar transposition Keyword columnar transposition: the grid, the column order, encryption and decryption.