The National Cryptologic Museum Activities Book: Codes, Ciphers, and Puzzles

A 22-page activity booklet produced in 1996 by the NSA's Center for Cryptologic History, issued in connection with the National Cryptologic Museum at Fort George G. Meade, Maryland.

The booklet presents a set of cipher and puzzle exercises for museum visitors, covering basic substitution and transposition techniques rather than offering a history or reference text. No individual author or compiler is credited; it was produced as an institutional publication of the Center for Cryptologic History, the NSA office that also oversees the museum's historical and library holdings.