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The American Cryptogram Association
The American Cryptogram Association (ACA) is a non-profit organization dedicated to promoting the hobby and art of cryptanalysis -- that is, learning to break ciphers.
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PayPal If you wish to use PayPal for paying your ACA dues or ACA For Sale items, please refer to the instructions on the membership page.

Free Web App. The ACA’s “Solve a Cipher!” program is now available as a free web app under the Resources tab. To access it, click HERE.

Tutorials for Sample Issue We now have tutorial solutions for all the ciphers in the free Sample Issue of The Cryptogram. Get your solving effort started with a nudge or follow along to see the complete solution of the cipher. It’s like looking over the shoulder of a friend solving a cipher.

THE RAT has made available for ACA members a program called Conmaker. It is designed for Windows users to easily create and submit cons to the ACA column editors. If interested, go to the Members Area / Downloads and get your copy.