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Discussion: Traffic Jam Applet tool
Topic: Caesar Cipher Tool
Related Item: http://mathforum.org/mathtools/tool/10/


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Subject:   Ciphering
Author: Craig Russell
Date: Feb 4 2004
Number theory responds: as long as the multiplier is relatively prime to 26, the
coding is unique.  Thus, the only possible multiplier "keys" are
3,5,7,9,11,15,17,19,21,23, and 25.  You might try an exercise: add three symbols
to the alphabet (a space, period, and comma are reasonable choices).  Then you
have 29 symbols, and 28 potential keys!

By the way, all Caesar ciphers are examples of substitution ciphers, the type of
"code" used in the "cryptoquote" puzzles published in many newspapers daily.
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