Leo Rosen
(1916-1991)
American cryptanalyst
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Leo Rosen (26 March 1916 – 16 March 1991) was an American cryptanalyst who worked with Frank Rowlett at Signals Intelligence Service (S.I.S.) before the start of World War II on Japanese ciphers. Rowlett found a method to read the messages enciphered on the Japanese PURPLE machine. Rosen deduced correctly the mechanism of the cipher machine, even though the mechanism used by PURPLE, telephone stepping switches, was substantially different from other machines (such as the wired rotor and pinwheel machines).
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| Born |
26 March 1916 Woodbine, New Jersey
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| Died |
16 March 1991 (aged 74) Arlington, Virginia
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| Zodiac | Aries |
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