American Cryptogram Association

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

2025 Convention Presentations now available

… on the 2025 Convention page under the Members menu.

ACA SWAG

Browse some of the merchandise available in the ACA Swag Shop under the “About” pull down tab or click the link below:

ACA Swag Page

EVENTS

2026 Convention

The 2026 ACA convention is being held in spectacular Niagara Falls, Canada, the Unofficial 8th Wonder of the World, on September 11 - 13, 2026, at the Ramada Hotel Near the Falls, 5706 Ferry Street. For reservations please call 1-888-442-6095 and request rooms for the group block for the "American Cryptogram Association". Reservations must be made by August 7, 2026.

A reminder for non-Canadians: you will need a passport to enter Canada. Please renew (or obtain) your passport as soon as possible, as this can take many weeks.