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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] An early entry on the Timeline of cryptography.
ROT13 is a Caesar cipher, a type of substitution cipher. In ROT13, the alphabet is shifted 13 steps. The simplest substitution ciphers are the Caesar cipher and Atbash cipher. Here single letters are substituted (referred to as simple substitution).
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] While Caesar's was the first recorded use of this scheme, other substitution ciphers are known to have been used earlier. [5 ...
Historical pen and paper ciphers used in the past are sometimes known as classical ciphers. They include simple substitution ciphers (such as ROT13) and transposition ciphers (such as a Rail Fence Cipher). For example, "GOOD DOG" can be encrypted as "PLLX XLP" where "L" substitutes for "O", "P" for "G", and "X" for "D" in the message.
In a substitution cipher, letters, or groups of letters, are systematically replaced throughout the message for other letters, groups of letters, or symbols. A well-known example of a substitution cipher is the Caesar cipher. To encrypt a message with the Caesar cipher, each letter of message is replaced by the letter three positions later in ...
The encryption step performed by a Caesar cipher is often incorporated as part of more complex schemes, such as the Vigenère cipher, and still has modern application in the ROT13 system. As for all single alphabet substitution ciphers, the Caesar cipher is easily broken and in practice offers no communication security.
Celebrity Cipher "Life itself is but the shadow of death, and souls departed but the shadows of the living." − Thomas Browne (Distributed by Andrews McMeel) Cryptoquote.
Generally the cipher used to encrypt the text is simple enough that the cryptogram can be solved by hand. Substitution ciphers where each letter is replaced by a different letter, number, or symbol are frequently used. To solve the puzzle, one must recover the original lettering.