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Cryptanalysis Trainer
We've transcribed from PDF to ASCII the cryptanalysis
program in Appendix F of the US Army's Field Manual
FM 34-40-2, Basic Cryptanalysis, September, 1990.
http://jya.com/appf.htm
Manual quote: "This program gives the capability to
encipher and decipher messages in monoalphabetic and
polyalphabetic substitution systems, produce a variety
of statistical data about the encrypted messages, and
print the results or save them to disk. Because of its
limited purpose, the program does not support on-screen
analysis. The printed results can be used off-line to
aid in analysis, however. The program should be
particularly useful in preparing examples and exercises
for training cryptanalytic techniques."