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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