Autokey Vigenère

A stronger variant of Vigenère where the keystream extends using the plaintext itself instead of repeating the key, removing Kasiski-style periodicity.

brokenclassical

Plaintext / Input Message

Cryptographic Key / Shift

Auto Compute

Workspace Presets

Save and restore visualizer settings in this browser.

Preset nameSave key with preset — disabled by default. Stored keys remain readable to anyone with access to this browser profile.

Saved presets for this cipher

Output Result

No output

Imported traces are validated and replayed locally. They never run a cipher operation automatically.