Welcome to the Crypto Drop Box

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Go to the Official ACA site

American Cryptogram Association Info Including sample issue, subscription information and Computer Column.

Graphics Files Hill Cipher Patent, Poe Cipher, Simple Simon Cipher, Porta's table, ...

Crypto Drop Box Resources Info about SI SI's crypto handbook, Army Field Manual, Lanaki's Crypto Course, Cipher Solvers, Pattern and Non-Pattern Dictionaries, and software, some real world classical ciphers: Kryptos, D'Agapeyeff, Beale (well, maybe "real" for this one!), Chinese Gold Bar ciphers,...

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Send comments and inquiries to:
Jerry Metzger (NORTH DECODER), <questions@cryptogram.org>