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Autoclave Cipher

Tool to decode AutoKey automatically. Autoclave cipher is a cryptographic system using the plaint text message as key, hence its other name: Autokey.

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Autoclave Cipher -

Tag(s) : Cryptography, Vigenere Variant

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# Autoclave Cipher

## Autoclave (Vigenere) Encoder

### Optional parameter

Tool to decode AutoKey automatically. Autoclave cipher is a cryptographic system using the plaint text message as key, hence its other name: Autokey.

### How to encrypt using Autoclave cipher

Autoclave encryption uses any cryptographic algorithm with a key (most algorithms are compatible).

The Autoclave principle consists in replacing the key by concatenating the key and the message (key + message).

Example: If the key is CLE. To encode DCODE with Autoclave, it is necessary to code normally with the chosen algorithm but with the key CLEDCODE.

Apply the selected algorithm to the plain text: the key change changes the encrypted message.

Example: The key is no longer CLE but CLEDCODE, the message encrypted by Vigenere is no longer FNSFP but FNSGG.

### How to decrypt Autoclave cipher

Decryption requires to know the chosen algorithm and the initial key.

Example: Decrypt the ciphered message NGMGG (crypted with Vigenere Autokey) and the key KEY.

The decryption begins normally for known letters of the key.

Example: Decryption of NGM with the key KEY gives DCO (the first letters of the plain text).

Next deciphering steps uses as key the first plain letters.

Example: Decryption of the next letters GG with the first letters of the plain text DC as key gives DE. The plain text is DCODE.

### How to recognize an Autoclave ciphertext?

Using Autokey changes properties of the ciphertext, generally the index of coincidence is lower than a normal index for a given algorithm.

### How to decipher Autoclave without key?

No magic method, but testing all one-letter keys can be useful. Indeed, key length can be short, it will be completed with plain text.

dCode try to find all probable key length and try all letters in order to maximize the probability for the text to be decrypted. (Method suggested by LeSingeMalicieux)