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A cipher is a simple method of modifying messages to make them unreadable, but still possible to recover. Common ciphers are Caesar, Vigenere, Atbash, and several types of substitution cipher. Other ciphers include polynomial ciphers such as Playfair, Foursquare, etc.

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I was wandering around Washington, D.C., recently, not paying attention to where I was, thinking about codes and ciphers, when suddenly it hit me. No, really: a blast of wind blew a paper right into m …
asked Jul 18 by msh210