American Cryptogram Association
Nonprofit organization established to promote the art and hobby of cryptanalysis. Provides news, events information, and cryptographic tools and resources.
Collection of daily cypher puzzles and solutions. Also presents other logical games including tic-tac-toe, sudoku, and master mind.
Discusses solutions, presents game resources, and gives statistics.
Explains the solutions and presents details of the cryptogram puzzle.
Highlights the interactive solver for cryptography puzzles.
Displays cryptological puzzles based on ancient Mythology. Also shows solution keys.
Presents weekly cryptological problems with solutions. Also compiles archives of past puzzles.
Free cryptogram games. Hosts competitive cryptogram solving contests. With forums, chat, and rankings.
Collection of free cryptograms, cryptoquip, and "cryptoquote" puzzles. Includes cryptograms specially created for kids.