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The trifid cipher is a classical cipher invented by Félix Delastelle and described in 1902. [1] Extending the principles of Delastelle's earlier bifid cipher, it combines the techniques of fractionation and transposition to achieve a certain amount of confusion and diffusion: each letter of the ciphertext depends on three letters of the plaintext and up to three letters of the key.
Download QR code; Print/export Download as PDF; Printable version; In other projects ... Tap code; Transposition cipher; Trifid cipher; Two-square cipher; V. VIC cipher;
This cipher combines fractionation with transposition, and was an early cipher to implement the principles of confusion and diffusion. David Kahn described it as a "system of considerable importance in cryptology." [2] Delastelle's other polygraphic substitution ciphers included the trifid [3] and four-square ciphers. [4]
In this way, each ciphertext character depends on two plaintext characters, so the bifid is a digraphic cipher, like the Playfair cipher. To decrypt, the procedure is simply reversed. Longer messages are first broken up into blocks of fixed length, called the period, and the above encryption procedure is applied to each block.
Codes operated by substituting according to a large codebook which linked a random string of characters or numbers to a word or phrase. For example, "UQJHSE" could be the code for "Proceed to the following coordinates." When using a cipher the original information is known as plaintext, and the encrypted form as ciphertext. The ciphertext ...
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Comparing this table with a lower one, it is evident that it is not the modern straddling checkerboard, and letters encoded with one digit are not the most frequent letters of Latin (T is much more frequent than O [2]), but the idea exploited in the latter ciphers is present.
Celebrity Cipher, distributed by Andrew McMeel, is another cipher game in contemporary culture, challenging the player to decrypt quotes from famous personalities. [6] A cryptoquip is a specific type of cryptogram that usually comes with a clue or a pun. The solution often involves a humorous or witty phrase. [7]