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ROT13 is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the Latin alphabet.. ROT13 is a special case of the Caesar cipher which was developed in ancient Rome, used by Julius Caesar in the 1st century BC. [1]
The Caesar cipher is named for Julius Caesar, who used an alphabet where decrypting would shift three letters to the left. The Caesar cipher is named after Julius Caesar , who, according to Suetonius , used it with a shift of three (A becoming D when encrypting, and D becoming A when decrypting) to protect messages of military significance. [ 4 ]
The following phrases come from a portable media player's seven-segment display. They give a good illustration of an application where a seven-segment display may be sufficient for displaying letters, since the relevant messages are neither critical nor in any significant risk of being misunderstood, much due to the limited number and rigid domain specificity of the messages.
Lord Playfair, who heavily promoted its use.. Playfair cipher was the first cipher to encrypt pairs of letters in cryptologic history. [2] Wheatstone invented the cipher for secrecy in telegraphy, but it carries the name of his friend Lord Playfair, first Baron Playfair of St. Andrews, who promoted its use.
Deciphering is identical to enciphering, with the ciphertext letter being located in the "left" alphabet while the corresponding plaintext letter is read from the "right" alphabet. A detailed description of the Chaocipher algorithm is available [ 4 ] as well as discussions of the deciphered plaintexts [ 6 ] and the solution to Byrne's challenge.
The Atbash cipher is a particular type of monoalphabetic cipher formed by taking the alphabet (or abjad, syllabary, etc.) and mapping it to its reverse, so that the first letter becomes the last letter, the second letter becomes the second to last letter, and so on. For example, the Hebrew alphabet would work like this:
Atbash exchanges each letter in a word or a phrase by opposite letters. Opposite letters are determined by substituting the first letter of the Hebrew alphabet (aleph) with the last letter (tav), the second letter (bet) with the next to last (shin), etc. The result can be interpreted as a secret message or calculated by the standard gematria ...
For this encipherment Alberti used a decoder device, his cipher disk, which implemented a polyalphabetic substitution with mixed alphabets. Johannes Trithemius —in his book Polygraphiae libri sex (Six books of polygraphia), which was published in 1518 after his death—invented a progressive key polyalphabetic cipher called the Trithemius ...