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An Unforgettable Substitution Code
The characters in the two keywords give the beginning of the encryption alphabet completed by the remaining characters.


Spaces and interpunction should be removed in practice. Long messages should be encoded by methods which make cryptanalysis by letter frequencies difficult.

"An Unforgettable Substitution Code" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/AnUnforgettableSubstitutionCode/
Contributed by: Michael Schreiber
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