Bifid cipher
Bifid cipher In classical cryptography, the bifid cipher is a cipher which combines the Polybius square with ...
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Trifid cipher
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 ...
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Substitution cipher
Substitution cipher In cryptography, a substitution cipher is a method of encryption by which ... compared with transposition ciphers. In a transposition cipher, units of the plaintext are rearranged in ... left unchanged. By contrast, in a substitution cipher, the units of the plaintext are retained ... a number of different types of substitution cipher. If the cipher operates on single ...
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Transposition cipher
Transposition cipher In classical cryptography, a transposition cipher changes one character from the plaintext to ... implementations. Rail fence In the rail fence cipher, the plaintext is written downwards on successive ... of transmission by telegraph.) The rail fence cipher is not very strong; the number of ... easiest way to decipher a rail fence cipher is to use the following method: ...
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Hill cipher
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 ... in 1929, it was the first polygraphic cipher in which it was practical (though ...
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Classical cipher
Classical cipher In cryptography, a classical cipher is a type of cipher used historically but which now have fallen ... are more advanced mechanical or electro-mechanical cipher machines, such as the Enigma machine. Classical ... ciphers and substitution ciphers. In a substitution cipher, letters (or groups of letters) are ...
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Caesar cipher
Caesar cipher The action of a Caesar cipher is to move each letter a number ... in the ciphertext. In cryptography, a Caesar cipher, also known as a Caesar's cipher or the shift cipher, is one of the simplest and ...
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Vigenère cipher
Vigenère cipher The Vigenère cipher is named for Blaise de Vigenère (pictured ... although Giovan Batista Belaso had invented the cipher earlier. Vigenère did invent a stronger autokey cipher. The Vigenère cipher is a method of encryption that ...
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Autokey cipher
Autokey cipher A tabula recta for use with an autokey cipher An autokey cipher is a cipher which incorporates the message (the plaintext) into ... key. There are two forms of autokey cipher: key autokey and text autokey ciphers. ...
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Polyalphabetic cipher
Polyalphabetic cipher A polyalphabetic cipher is any cipher based on substitution, using multiple substitution alphabets. The Vigenère cipher is probably the best-known example of a polyalphabetic cipher, though it is a simplified special ...
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