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Genevieve Marie Grotjan Feinstein (April 30, 1913 – August 10, 2006) was an American mathematician and cryptanalyst. She worked for the Signals Intelligence Service throughout World War II, during which time she played an important role in deciphering the Japanese cryptography machine Purple, and later worked on the Cold War-era Venona project .
Genevieve Grotjan Feinstein was a skilled cryptanalyst whose discovery in September 1940 changed the course of history. Her successful breakthrough enabled the Army Signal Intelligence Service (SIS) to build an analog machine that solved the Japanese diplomatic system known as "Purple."
Print. IT WAS SEPT. 20, 1940, a hot, sticky day, and Genevieve Grotjan (BA ’36) was calmly scrutinizing the enciphered messages spread out before her on a plain wooden table—as she had been doing on a near daily basis for the past year. The pressure was unrelenting on members of her small U.S. Army Signal Intelligence Service (SIS) team to ...
The women cryptologists were held to strict secrecy and would become one of the best-kept secrets of WWII. This lesson shares the background of three of these women: Genevieve Grotjan Feinstein, Ada Stemple Nestor, and Ann Caracristi, who all were recruited and served for SIS at Arlington Hall Station.
13 de mar. de 2020 · Genevieve Grotjan, by now Genevieve Feinstein, left the cryptologic business in 1947. Elizebeth Friedman Elizebeth Smith, an English literature graduate of Hillsdale College in Michigan, began her cryptologic career in 1916 at Riverbank Laboratory, a research lab outside Chicago.
23 de oct. de 2017 · Cryptographer Genevieve Grotjan Feinstein received an exceptional civilian service award from Brig. Gen. P.E. Peabody in May 1946. Feinstein was a junior cryptologist with the signal intelligence service and participant in solving the “Purple Code” during World War II.
20 de jun. de 2022 · 1 Small served as a US Army liaison to Bletchley Park from October 1944 until May 1945. In 1944 he received a secret US patent (2,984,700) for “Method and Apparatus for Cryptography.”. Small’s patent included the method that was later called re-entry, or reinjection. Re-entry was used in the KL-7 rotor-based cipher machine.
