# Cipher

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**Alberti cipher**— The Alberti Cipher was one of the first polyalphabetic ciphers. Leon Battista Alberti Created in the 15th century (1466/67) by Leon Battista Alberti, it was the peak of cryptography at that time.Its inventor was Leon Battista Alberti, an… …122

**XOR cipher**— In cryptography, a simple XOR cipher is a relatively simple encryption algorithm that operates according to the principles::A oplus 0 = A,:A oplus A = 0,:(B oplus A) oplus A = B oplus 0 = B,where oplus denotes the exclusive disjunction (XOR)… …123

**Rip van Winkle cipher**— In cryptography, the Rip van Winkle cipher is a provably secure cipher with a finite key, assuming the attacker has only finite storage. The cipher requires a broadcaster (perhaps a numbers station) publicly transmitting a series of random… …124

**Lucifer (cipher)**— In cryptography, Lucifer was the name given to several of the earliest civilian block ciphers, developed by Horst Feistel and his colleagues at IBM. Lucifer was a direct precursor to the Data Encryption Standard. One version, alternatively named… …125

**Iraqi block cipher**— In cryptography, the Iraqi block cipher was a block cipher published in C source code form by anonymous FTP upload around July 1999, and widely distributed on Usenet. It is a five round unbalanced Feistel cipher operating on a 256 bit block with… …126

**Four-square cipher**— The Four square cipher is a manual symmetric encryption technique. It was invented by famous French cryptographer Felix Delastelle.The technique encrypts pairs of letters ( digraphs ), and thus falls into a category of ciphers known as… …127

**Beaufort cipher**— The Beaufort cipher, created by Sir Francis Beaufort, is a substitution cipher that is similar to the Vigenère cipher but uses a slightly modified enciphering mechanism and tableau.Using the cypherTo encrypt (or decrypt for that matter), first… …128

**QUAD (cipher)**— Infobox block cipher name = QUAD caption = designers = Côme Berbain, Henri Gilbert and Jacques Patarin publish date = May 28, 2006 (at Eurocrypt) derived from = derived to = related to = certification = key size = 80 bits structure = multivariate …