Solitaire cryptosystem

"Solitaire" is a cryptosystem designed by Bruce Schneier. It is featured in the novel "Cryptonomicon" by Neal Stephenson. I have written a small Palm Pilot application to implement it. Here's the zip file (10KB, source and executable). Please report bugs and suggest improvements. This is version 1.1; 1.0 had a small memory access bug which is now fixed.