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

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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.

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.

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trithemius,shift,ascending,sequence,caesar

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