Kryptographik Lehrbuch der Geheimschreibekunst (Cryptology: Instruction Book on the Art of Secret Writing) is an 1809 book on cryptography written by Johann Ludwig Klüber.[1]
In 2011 the National Security Agency included a copy of Kryptographik, used by a German cryptographer during World War II, as part of a 50,000 page release of classified documents.[2][3]
References edit
- ^ The New International Encyclopædia Volume 6. Dodd, Mead. 1925. p. 325.
- ^ "The National Security Agency Releases Over 50,000 Pages of Declassified Documents". NSA. 8 June 2011. Archived from the original on March 27, 2012.
- ^ "Update to 8 June 2011 Press Release" (PDF). NSA. 19 August 2011. Retrieved 23 September 2020.
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