American Cryptogram Association

The American Cryptogram Association (ACA) is an American non-profit organization devoted to the hobby of cryptography, with an emphasis on types of codes, ciphers, and cryptograms that can be solved either with pencil and paper, or with computers, but not computer-only systems. == History == The ACA was formed on September 1, 1930.

Source: Wikipedia — American Cryptogram Association (CC BY-SA 4.0)