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Trevanion Cipher

Tool to decrypt messages according to Trevanion. Trevanion cipher is a principle of steganography based on the position of the letters and punctuation in a text.

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Trevanion Cipher -

Tag(s) : Steganography

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Trevanion Cipher

Trevanion Decoder



Trigger/Mark Options



Extraction of Characters Options





Answers to Questions (FAQ)

How to encrypt using Trevanion method?

Encryption involves taking a text and be pay attention to position of the punctuation so that after each sign (comma, dot, period, semicolon, exclamation mark, question mark, etc.), after counting a number of letters (eg 3 letters) a letter from the hidden message is found.

Example: In the sentence Wow! How did he do? Incredible! Did you see that? Exact position. the letters directly following each ponctuation sign are: H,I,D,E which is the hidden message.

How to decrypt Trevanion cipher?

Decryption requires to know of the shift N used.

To find the plain text it is necessary to browse the text in search of the signs of punctuation. After each one, count a number of characters (N) to find a new letter of the plaintext.

Example: This website, I admit, is cool! Prodigious tools, so dazzling things here. Great job!

Example: With N=3, The original plain text is DCODE.

How to recognize Trevanion ciphertext?

The message, if well done, is theoretically impossible to recognize.

How to decipher Trevanion without knowing the parameters?

dCode can attempt the most classic combinations, different shifts and modes.

What are the variants of the Trevanion cipher?

It is possible to set the trigger characters, eg. to use characters other than the classical punctuation.

The method for calculating the offset may be different for each person, some will count for all characters, others will treat only letters.

Example: `GO! ATTACK!' has for 3rd letter A, for 4th character _ (space) or ! (if space is ignored).

When Trevanion was invented?

17th century but the author is probably not John Trevanion. The name of this code was given in honor of John Trevanion, an English, a prisoner who received a letter from a friend using this principle. But historians have found inconsistencies in this story and its authenticity is called into question.

Source code

dCode retains ownership of the online "Trevanion Cipher" tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any "Trevanion Cipher" algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any "Trevanion Cipher" function (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and no data download, script, copy-paste, or API access for "Trevanion Cipher" will be for free, same for offline use on PC, tablet, iPhone or Android ! dCode is free and online.

Need Help ?

Please, check our dCode Discord community for help requests!
NB: for encrypted messages, test our automatic cipher identifier!

Questions / Comments

Thanks to your feedback and relevant comments, dCode has developed the best 'Trevanion Cipher' tool, so feel free to write! Thank you!


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