Abraham Sinkov
Abraham Sinkov | |
---|---|
Born | Philadelphia, Pennsylvania, U.S. | August 22, 1907
Died | January 19, 1998 Maricopa, Arizona, U.S. | (aged 90)
Citizenship | American |
Alma mater |
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Scientific career | |
Fields | Cryptography, Mathematics |
Institutions |
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Thesis | Families of Groups Generated by Two Operators of the Same Order (1933) |
Doctoral advisor | Francis Edgar Johnston |
Abraham Sinkov (August 22, 1907 – January 19, 1998) was a US cryptanalyst. An early employee of the U.S. Army's Signal Intelligence Service, he held several leadership positions during World War II, transitioning to the new National Security Agency after the war, where he became a deputy director. After retiring in 1962, he taught mathematics at Arizona State University.
Biography
Sinkov was the son of Jewish immigrants Morris (Mordechai Eliezer) and Ethel (née Etel Constantinowsky)[1] from Alexandria, Russia, which is now Oleksandriya, Kirovohrad Oblast, Ukraine.[2] Sinkov was born in Philadelphia, but grew up in Brooklyn. After graduating from Boys High School he took his B.S. in mathematics from City College of New York. (By coincidence, one of his close friends at Boys High and CCNY was Solomon Kullback). Mr. Sinkov taught in New York City schools but was unhappy with the working conditions and anxious to use his mathematics knowledge in practical ways.
Early career
The opportunity for a career change came in 1930. Sinkov and Kullback took the Civil Service examination and placed high. Both received mysterious letters from Washington asking about their knowledge of foreign languages. Sinkov knew French and Kullback, Spanish. This was acceptable to their prospective employer, and they were offered positions as junior cryptanalysts. Although neither was quite certain what a cryptanalyst did, they accepted.
The small
World War II
SIS grew slowly throughout the early 1930s. However, successes against
In 1940, even though the United States was not officially a combatant, the U.S. and
Sinkov mission
In January 1941, while Britain battled
After the Japanese
In July 1942, by now Major Sinkov arrived in Melbourne as commander of the American detachment at Central Bureau. The Director of CB on paper was General Spencer B. Akin, MacArthur's chief signal officer, but General Akin in practice seldom visited the organization. He had worked with Sinkov in Washington and in Panama, and confidently left CB operations under his control.
Sinkov, who demonstrated strong organizational and leadership qualities in addition to his mathematics skills, brought this group of Americans and Australians—representing also different military services from their countries—into a cohesive unit. CB quickly became a trusted producer of
Post-war
After the war, Sinkov rejoined SIS, now renamed the Army Security Agency, and, in 1949, when the
In 1954, Sinkov became the second NSA official to attend the
In 1966, he wrote Elementary Cryptanalysis: A Mathematical Approach, one of the first books on the subject, directed at high school students and available to the general public.
Retirement
Abraham Sinkov lived in retirement in Arizona after two careers, 32 years in NSA (and its predecessors), followed by an appointment as a professor of mathematics at Arizona State University.
Hall of fame
Colonel Sinkov is a member of the Military Intelligence Hall of Fame.
Books written
- Abraham Sinkov (1966), Elementary Cryptanalysis: A Mathematical Approach, Mathematical Association of America, Washington, D.C. ISBN 978-0-88385-937-7(electronic).
References
- ^ "Pennsylvania birth certificate of Abraham Sinkoff [sic]". Ancestry.com. Retrieved 25 December 2019.
- ^ "Naturalization Petition of Morris Sinkov". Ancestry.com. Retrieved 25 December 2019.
- ISBN 9781925322187.
- ^ "How the British and Americans started listening in". BBC News. 2016-02-08. Retrieved 2023-04-02.
- NSA Hall of Honor entry for Sinkov (public domain; a previous version of this article was derived from this NSA work)