Tool to decrypt/encrypt Trithemius. The Trithemius cipher is a polyalphabetic encryption method invented by the German abbot Trithemius. This code is a sequence of shifts from 0 to N shift in the alphabet.

Trithemius Cipher - dCode

Tag(s) : Poly-Alphabetic Cipher

dCode is free and its tools are a valuable help in games, maths, geocaching, puzzles and problems to solve every day!

A suggestion ? a feedback ? a bug ? an idea ? *Write to dCode*!

The encryption uses successive shifts (positive and ascending - ie. to the right) in the alphabet from 0 to N where N is the length of the text.

__Example:__ To code DCODE shift D from 0 an get D, shift C by 1 and get D, shift O by 2 and get Q, shift D by 3 and get G, and shift E by 4 and get I. The coded message is DDQGI.

With a classical alphabet ABCDEFGHIJKLMNOPQRSTUVWXYZ, **Trithemius** cipher is equivalent to a Vigenere cipher with ABCDEFGHIJKLMNOPQRSTUVWXYZ or equivalent to a Caesar cipher with a shift that increases by 1 by each letter starting at 0.

Decryption requires successively shifting in the other direction in the alphabet. To shift negatively to the right is equivalent to shift positively to the left.

__Example:__ To decode TSKWLJSPCB shift T by 0 and get T, shift S by -1 and get R, shift K by -2 and get I, etc. The plain message is **TRITHEMIUS**.

- The shift may be ascending/increasing or descending/decreasing.

- By default, the shift starts at 0, but it is conceivable to start it at 1 or any other number.

- The alphabet used can be a deranged alphabet or a completely personalized alphabet.

- Other types of shift sequences may be imagined (see shift ciphers).

The ciphered message has a low index of coincidence (0.04-0.05).

During Renaissance, near 1480.

dCode retains ownership of the online 'Trithemius Cipher' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any 'Trithemius Cipher' algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any 'Trithemius 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 'Trithemius Cipher' will be for free, same for offline use on PC, tablet, iPhone or Android ! dCode is free and online.

Please, check our dCode Discord community for help requests!

NB: for encrypted messages, test our automatic cipher identifier!

trithemius,shift,ascending,sequence,caesar

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

© 2021 dCode — The ultimate 'toolkit' to solve every games / riddles / geocaching / CTF.

Feedback

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