Our interest in cryptography is amateur, not professional. We date back to the 20's, and are quite unique. There is not another organization like us in the world. Our members construct problems in classical cipher systems for other members to solve without knowing the secret key. We do not get involved in secret messages of companies or governments.
Members make up and solve their own creations strictly for the fun of it.
Every two months our ciphers are published in the ACA journal, The Cryptogram . Each issue contains about 100 ciphers. They range from very easy to the formidable, in some sixty different systems. Some you probably have seen already, like those found on newspaper puzzle pages. Others you probably won't know unless you are experienced in the field.