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Secret Treasure

The National Cryptologic Museum, at Fort Meade, Md., home of thousands of code-breaking and code-making artifacts dating back to the 1500s, has acquired a major collection of books on codes and ciphers, the museum said. It was donated by David Kahn, a leading American scholar of cryptology and the author of “The Codebreakers: The Story of Secret Writing.” The collection includes “Polygraphiae Libri Sex” (1518) by Johannes Trithemius, the first known printed book on cryptology, along with notes of interviews with modern cryptologists, memos, photocopies and pamphlets. About a dozen items from the collection are currently on display. JULIE BOSMAN

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