An Unforgettable Substitution Code

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The characters in the two keywords give the beginning of the encryption alphabet completed by the remaining characters.
Contributed by: Michael Schreiber (March 2011)
Open content licensed under CC BY-NC-SA
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Details
Spaces and interpunction should be removed in practice. Long messages should be encoded by methods which make cryptanalysis by letter frequencies difficult.
Permanent Citation
"An Unforgettable Substitution Code"
http://demonstrations.wolfram.com/AnUnforgettableSubstitutionCode/
Wolfram Demonstrations Project
Published: March 7 2011