Dr. David Kahn, cryptologic historian and author, graciously donated his vast collection to the Museum, through the National Cryptologic Museum Foundation (NCMF). Included in our exhibit are two of the original drafts of his seminal work, The Codebreakers, which Dr. Kahn wrote, and rewrote, before its publication. Dr. Kahn collected books, artifacts, articles, and material as his research progressed over the years. A few of the more interesting or unique items are now on display: autographed copies of Elements of Cryptanalysis by William Friedman and The American Black Chamber by Herbert Yardley; a French manual on protecting private conversations; and, as an example of the eclectic and diverse nature of collection, a Nazi propaganda program.