# bifid cipher

- раздвоенный шифр (разновидность шифра колонной перестановки).

*English-Russian cryptological dictionary .
2014.*

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**Bifid cipher**— In classical cryptography, the bifid cipher is a cipher which combines the Polybius square with transposition, and uses fractionation to achieve diffusion. It was invented around 1901 by Felix Delastelle. Operation First, a mixed alphabet… … Wikipedia**Bifid**— may mean:* Bifid rib, bifurcated rib or sternum bifidum a congenital abnormality of the human anatomy * Bifid cipher a type of cipher … Wikipedia**Trifid cipher**— In classical cryptography, the trifid cipher is a cipher invented around 1901 by Felix Delastelle, which extends the concept of the bifid cipher to a third dimension, allowing each symbol to be fractionated into 3 elements instead of two. That is … Wikipedia**Hill cipher**— Hill s cipher machine, from figure 4 of the patent In classical cryptography, the Hill cipher is a polygraphic substitution cipher based on linear algebra. Invented by Lester S. Hill in 1929, it was the first polygraphic cipher in which it was… … Wikipedia**Transposition cipher**— In cryptography, a transposition cipher is a method of encryption by which the positions held by units of plaintext (which are commonly characters or groups of characters) are shifted according to a regular system, so that the ciphertext… … Wikipedia**Numerical cipher**— In classical cryptography, the numerical chiper which combines the Polybius square with transposition, and uses fractionation to achieve diffusion. It was invented around 1904 by Albus Volger. Operation First, a mixed alphabet Polybius square is… … Wikipedia**Substitution cipher**— In cryptography, a substitution cipher is a method of encryption by which units of plaintext are replaced with ciphertext according to a regular system; the units may be single letters (the most common), pairs of letters, triplets of letters,… … Wikipedia**Caesar cipher**— The action of a Caesar cipher is to replace each plaintext letter with one fixed number of places down the alphabet. This example is with a shift of three, so that a B in the p … Wikipedia**Classical cipher**— A cipher is a means of concealing a message, where letters of the message are substituted or transposed for other letters, letter pairs, and sometimes for many letters. In cryptography, a classical cipher is a type of cipher that was used… … Wikipedia**Book cipher**— A book cipher is a cipher in which the key is some aspect of a book or other piece of text; books being common and widely available in modern times, users of book ciphers take the position that the details of the key is sufficiently well hidden… … Wikipedia**Pigpen cipher**— The pigpen cipher uses graphical symbols assigned according to a key similar to the above diagram.[1] The pigpen cipher (sometimes referred to as the masonic cipher, Freemason s cipher, Rosicrucian cipher, or Tic tac toe cipher) … Wikipedia