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Caesar cipher - Wikipedia Caesar cipher The action of a Caesar cipher is to replace each plaintext letter with a different one a fixed number of places down the alphabet The cipher illustrated here uses a left shift of 3, so that (for example) each occurrence of E in the plaintext becomes B in the ciphertext
Classical cipher - Wikipedia Substitution ciphers 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
Substitution cipher - Wikipedia 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) It can be demonstrated by writing out the alphabet twice, once in regular order and again with the letters shifted by some number of steps or
Vigenère cipher - Wikipedia The Vigenère square or Vigenère table, also known as the tabula recta, can be used for encryption and decryption In a Caesar cipher, each letter of the alphabet is shifted along some number of places For example, in a Caesar cipher of shift 3, a would become D, b would become E, y would become B and so on The Vigenère cipher has several Caesar ciphers in sequence with different shift
ROT13 - Wikipedia 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 can be referred by "Rotate13", "rotate by 13 places", hyphenated "ROT-13" or sometimes by
Ciphertext - Wikipedia Historical pen and paper ciphers used in the past are sometimes known as classical ciphers They include: Substitution cipher: the units of plaintext are replaced with ciphertext (e g , Caesar cipher and one-time pad) Polyalphabetic substitution cipher: a substitution cipher using multiple substitution alphabets (e g , Vigenère cipher and Enigma machine) Polygraphic substitution cipher: the
Category:Classical ciphers - Wikipedia Wikimedia Commons has media related to Classical ciphers Pages in category "Classical ciphers" The following 53 pages are in this category, out of 53 total This list may not reflect recent changes
Cipher - Wikipedia In casual contexts, "code" and "cipher" can typically be used interchangeably; however, the technical usages of the words refer to different concepts Codes contain meaning; words and phrases are assigned to numbers or symbols, creating a shorter message An example of this is the commercial telegraph code which was used to shorten long telegraph messages which resulted from entering into