Autokey Cipher

Extend the keyword with the plaintext itself so the key never repeats. Type in either panel and watch the transformation update live.

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Plaintext input for encryption

Select Cipher:

Current shift: 3

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Ciphertext input for decryption

All ciphers

Caesar Cipher
Atbash Cipher
Affine Cipher
Polybius Square Cipher
Alberti Cipher
Vigenère Cipher
Autokey Cipher
Playfair Cipher
Hill Cipher
ADFGVX Cipher
Scytale Cipher
Rail Fence Cipher
Columnar Transposition Cipher
Enigma Machine
One-Time Pad (Vernam)