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.
Trithemius Cipher - dCode
Tag(s) : Poly-Alphabetic Cipher
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Trithemius Cipher
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Trithemius Decoder
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.
Answers to Questions
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. 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.
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 (0.04-0.05).
When Trithemius have been invented ?
During Renaissance, near 1480.
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Source code
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