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 refer to the instructions on the membership page and use the fee calculator to get the correct amount.

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.



NE Mini Con: April 24, 25 2015

Mark your calendars for April 24, 25, 2015 as this year marks the 20th anniversary of the first mini-con started by LIONEL. We have found a location pretty close to the first. We so hope you can make it.

Hotel: Hyatt House, 200 Corporate Drive, Windsor, CT. 06095 telephone (860) 298.8000. Please book by April 10 for our discounted rate and please remember to mention that you are an ACA member. The room rate is $93.00 + tax per night. Please book by telephone. We need 10 rooms rented for a free meeting room.

Friday: Dinner will be provided (donations accepted) in the hotel meeting room, then time to greet new and old friends.

Saturday: During the day, members will meet in the meeting room to enjoy presentations from other members. Lunch will be provided for members and of course spouses. Dinner will be at a local restaurant and then back to the meeting room for some solving.

For more information or if you would like to make a presentation please contact MSCREP at or ARDUINNA at . More information will be coming through the ACA website as we finalize the details.

2015 ACA Annual Convention Washington, DC-Chantilly, VA

This year’s convention will be based in Chantilly, VA, a suburb of our nation’s capital, and will be held during the period August 25 – 30, 2015. We hope you will make plans to join your hosts ASYMPTOTE and G-MAN and the rest of the Krewe for what we believe will be an enjoyable and enlightening event.

Join your fellow members in participating in an opportunity to meet and interact with others who share your interests in what is admittedly a pretty specialized area of interest. Share your knowledge of cryptography, from historical aspects to solving methods, with your fellow members. And, along the way, take advantage of this opportunity to visit Washington, DC, with its many historical and educational sites, many of which are free to all.

The convention hotel will be the Wingate by Wyndham Hotel Chantilly-Dulles, located at 3940 Centerview Drive, Chantilly, VA, 20151, telephone: 571-203-0999. We have negotiated a rate of $89.00 per night (plus 12% city and state taxes), for our members. These rates apply during the entire period cited above. It may also be possible for members to receive this special rate for dates outside the group block period, depending on room availability.

The hotel offers its guests all of the usual amenities, including free 24-hour shuttle service to and from Dulles Airport; complimentary hot breakfast; free local and 1-800 access calls; free in-room wired and wireless internet access and telephones; a 24-hour business center, which includes use of fax, copier and computers; in-room flat-screen TV, microwave, refrigerator, coffee maker, etc.; as well as an indoor pool, fitness center and whirlpool.

A wide range of activities are now being considered for those attending, including sight-seeing, museums tours (including the Smithsonian, National Gallery of Art, Museum of the American Indian, to name a few), visits to privately-operated museums such as the Museum of Crime and Punishment, Civil War battlefield tours and shopping. A visit to the Udvar-Hazy Center, an adjunct of the National Air and Space Museum located only minutes from our hotel, will be on the agenda and will provide an opportunity to see the Space Shuttle Discovery, the SR-71 Blackbird, the B-29 bomber Enola Gay, and numerous other aircraft from biplanes to jets and rockets.

Members who would be willing to make a presentation during the convention should contact one of your hosts and volunteer to share your knowledge of our hobby.

Hotel reservations may be made now, but must be made by August 1, 2015, to be eligible for the group rate. Please call the hotel directly at 571-203-0999 and identify yourself as an ACA member. Do not make your reservation through a travel agent or on-line to insure you get the group rate and that the ACA is credited for your attendance. This helps to keep convention costs down.

Further details concerning our convention agenda will be published in the next issue of The Cryptogram.