Louis Kruh

Louis Kruh died at the age of 87 on 1 May 2010. See David Kahn, "Louis Kruh, Cryptologist, Editor, Activist," Cryptologia 34, no. 3 (Jul. 2010): 197-199.

"An Armchair View of the Smithsonian Institution Cipher Machine Exhibit." Cryptologia 9, no. 1 (Jan. 1985): 38-51.

This article surveys (photographs of some of the machines exhibited are included) the Smithsonian exhibition "Cipher Machines: World War I-World War II."


Kruh, Louis. "British-American Cryptanalytic Cooperation and an Unprecedented Admission by Winston Churchill." Cryptologia 13, no. 2 (Apr. 1989): 123-134.

Included here is correspondence between Churchill and Roosevelt documenting that the British had decrypted American diplomatic traffic.


Kruh, Louis. "Cryptology and the Law--IV." Cryptologia 9, no. 4 (1985): 348-350. [Petersen]


Kruh, Louis. "Early Communications Security in the U.S. Navy." Cryptologia 9, no. 4 (Oct. 1985): 324-331.


Kruh, Louis. "Memories of Friedman." Cryptologia 4, no. 1 (Jan. 1980): 23-26


Kruh, Louis. "The Navy Cipher Box Mark II." Cryptologia 6, no. 1 (Jan. 1982): 85-93.


Kruh, Louis. "A Pictorial Tour of the National Cryptologic Museum." Cryptologia 18, no. 4 (Oct. 1994): 381-389.

The author gives a brief introduction to the National Cryptologic Museum, calling it "a very professional and polished exhibition of cryptologic artifacts," followed by 16 black-and-white photographs of exhibits.


Kruh, Louis. "Reminiscences of a Master Cryptologist." Cryptologia 4, no. 1 (Jan. 1980): 45-50.

Petersen: "Frank B. Rowlett."


Kruh, Louis. The Shortsighted View of a Foresighted Admiral." Cryptologia 11, no. 3 (Jul. 1987): 156-159.

Petersen: "Adm. Hooper and Herbert Yardley."


Kruh, Louis. "Stimson, the Black Chamber, and the 'Gentlemen's Mail' Quote." Cryptologia 12, no. 2 (Apr. 1988): 65-83.

Lowenthal calls this article a "[f]resh, well-researched look at one of the most famous incidents ... in U.S. intelligence history." Similarly, Sexton sees it as a "thorough examination of the circumstances and reasons for Secretary Stimson's withdrawal of State Department support of Yardley's Black Chamber."


Kruh, Louis. "Tales of Yardley: Some Sidelights to His Career." Cryptologia 13, no. 4 (Oct. 1989): 327-357.


Kruh, Louis. "Unlocking Enigma's Secrets." Cryptologia 14, no. 4 (Oct. 1990): 366-369.

Discusses a then-new exhibit at the Smithsonian Institution.


Kruh, Louis. "Vint Hill Farms Station." Cryptologia 23, no. 3 (Jul. 1999): 259-260.

Provides some highlights from the station's work in World War II.


Kruh, Louis. "Why Was Safford Pessimistic About Breaking the German Enigma Cipher Machine in 1942?" Cryptologia 14, no. 3 (Jul. 1990): 253 257.

According to Sexton, this article explores the "meaning of Captain Laurance F. Safford's remark of March 1942 that 'our prospects of ever breaking the German ENIGMA cipher machine are rather poor.'"


Kruh, Louis, and Ralph Erskine. "Yardley Revisited, Again." Cryptologia 13, no. 1 (Jan. 1989): 85-88.


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