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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.
News

This website is still under-construction. Please be patient. Some changes take time to learn how to do. Nothing is as easy as it looks from the outside.

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 for users of Google’s Chrome web browser. To get it, click HERE, or go to the Chrome Web Store and search on “ciphers”.

New Expanded Free Sample Issue The free sample issue of The Cryptogram available for download has been expanded with more explanations and many more ciphers to solve. Read about it and download it on the Sample Issue page under About the ACA.

2nd Edition PHOENIX Memorial CDROM A member reported that the links on the index page of the 2nd Edition PHOENIX Memorial CDROM did not work with Acrobat Reader v9. It turned out to be caused by the default value of a preference option. Here is how it was corrected:
Edit->Preferences Documents->View Documents in PDF/A mode: NEVER
From the Edit menu, select “Preferences”, then choose to look under Category “Documents”.
The option “View Documents in PDF/A mode” should be changed to “Never”.

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.