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

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