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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

2024 ACA Cipher Contest Winners:

COMPUTER SOLVING DIVISION
1. DANEEL    
2. XAMAN EK
3. SUSSI
 
PAPER/PENCIL DIVISION
1. DARING FLAIR
2. LATIN DUDE
3. DONALD DUCK
 
NOVICE DIVISION
1. BLUESTORMINATOR
2. CEREDWYN
3. WIRMZ

 
 

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