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| Cipher | Key | Fitness | Preview |
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All tools
- Vigenère cipher
Encrypt, decrypt, or break a repeating-keyword cipher.
- Beaufort cipher
The reciprocal variant: one operation encrypts and decrypts.
- Caesar cipher
Shift every letter by a fixed amount, or try all 26.
- ROT13
The self-inverse shift of 13 that hides spoilers.
- Atbash cipher
The ancient mirror alphabet: A becomes Z, B becomes Y.
- Autokey cipher
The key never repeats: the message itself extends it.
- Playfair cipher
Digraph substitution over a keyword-mixed 5×5 square.
- Quagmire I-IV
Vigenère variants with keyword-mixed alphabets.
- Substitution cipher
One scrambled alphabet replaces the standard one.
- Rail fence cipher
Zigzag transposition, broken by trying every rail count.
- Columnar transposition
Keyword-ordered columns, with a column-order solver.
- Polyalphabetic solver
Break any periodic cipher, even with fully mixed alphabets.
- Cipher identifier
Analyze unknown ciphertext to find the cipher and key length.
- Kryptos
The CIA sculpture: decrypt K1 and K2 with one click.