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Trithemius Cipher

Tool to decrypt/encrypt Trithemius. The Trithemius cipher is a polyalphabetic encryption method invented by the German abbot Trithemius during the Renaissance. This code is a sequence of shifts: the first letter is not shifted, the second is shifted up by 1 in the alphabet, the third by 2, etc.

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Trithemius Cipher -

Tag(s) : Cryptography, Poly-Alphabetic Cipher

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# Trithemius Cipher

## Trithemius Encoder

Tool to decrypt/encrypt Trithemius. The Trithemius cipher is a polyalphabetic encryption method invented by the German abbot Trithemius during the Renaissance. This code is a sequence of shifts: the first letter is not shifted, the second is shifted up by 1 in the alphabet, the third by 2, etc.

### How to encrypt using Trithemius cipher?

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 as key.

### How to decrypt Trithemius cipher?

Decryption requires successively shifting in the other direction in the alphabet.

Example: To decode DDQGI shift D by 0 and get D, shift D by -1 and get C, shift Q by -2 and get O, shift G by -3 and get D, and shift I by -4 and get E. The plain message is DCODE.

### What are the variants of the trithemius cipher?

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).

### How to recognize Trithemius ciphertext?

The ciphered message has a low index of coincidence (0.4-0.5).

### When Trithemius have been invented ?

During Renaissance, near 1480.