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.

Join Us!

Now is an ideal time to join the ACA. While supplies last, new members will receive a CD-ROM containing the contents of The Cryptogram from 1932 to 2009. For information on membership benefits and details on how to join see Membership.




If you wish to use PayPal as an option for paying your ACA dues or ACA For Sale items, please contact MANDRAKE:
treasurer (at) cryptogram (dot) org.

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:


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".

FBI Code Breaking Challenge.

The FBI has a website with a code breaking challenge. Check it out.

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.



2014 ACA Annual Convention

The National ACA Convention will be held August 22-24, at the Country Inn and Suites, 1837 Centre Point Circle, Naperville, IL, 60563. The rate is $89 per night (plus tax), which includes complimentary full breakfast buffet, Wifi, shuttle service within a 10 mile radius of the hotel, cookies and coffee in the lobby, and on Monday to Saturday at 5 p.m., fresh popcorn and pizza in the Fireside Lounge. The rate is also available for 3 days prior to and 3 days following the convention.

The hotel phone number is 630-505-3353. Up until July 31st, a certain number of rooms at this rate are held in a block for us. Please book before that date, and mention that you are with the American Cryptogram Association.

The convention will be hosted by CONFUOCO ( Members who want to present a talk on Saturday should contact NUCULAR (

More details will appear in the MJ14 Cryptogram and on the ACA website as they become available.