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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) : Poly-Alphabetic Cipher

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Autoclave Cipher

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Autokey (Vigenere) Decoder





Optional parameter


See also: Vigenere Cipher

Autoclave (Vigenere) Encoder




Optional parameter


See also: Vigenere Cipher

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

Answers to Questions

How to encrypt using Autoclave cipher

Autoclave encryption uses a cryptographic algorithm with a key (all algorithms are not compatible).

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

Example: If the key is SECRET. To encode AUTOCLAVE with Autoclave, code normally with the chosen algorithm but with the key SECRETAUTOCLAVE.

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

Example: The key is no longer SECRET but SECRETAUTOCLAVE, the message encrypted by Vigenere is no longer SYVFGESZG but SYVFGEAPX.

The size of the initial key must be smaller than the text size for the autoclave to work.

How to decrypt Autoclave cipher

Autoclave decryption requires to know the chosen algorithm and the initial key.

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

The decryption begins normally for known letters of the key.

Example: Decryption of SYVFGE with the key SECRET gives AUTOCL (the first letters of the plain text).

Next deciphering steps uses as key the first plain letters.

Example: Decryption of the next letters APX with the first letters of the plain text AUT as key gives AVE. The plain text is AUTOCLAVE.

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 offers a bruteforce mode that tries to find the probable length of the key, by testing different lengths of key word. For each letter, dCode attempts to maximize the probability that the text will be plain by frequency analysis. (Method suggested by LeSingeMalicieux)

What is an Autoclave?

Autoclave is the name of an industrial device that makes it possible to expose elements to high pressures and temperatures.

Autoclave is the name of a rock band and the name of an album of that same band.

Source code

dCode retains ownership of the source code of the script Autoclave Cipher online. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, Matlab, etc.) which dCode owns rights will not be released for free. To download the online Autoclave Cipher script for offline use on PC, iPhone or Android, ask for price quote on contact page !

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Team dCode likes feedback and relevant comments; to get an answer give an email (not published). It is thanks to you that dCode has the best Autoclave Cipher tool. Thank you.


Source : https://www.dcode.fr/autoclave-cipher
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