Hans Rohrbach

Hans Rohrbach was a German mathematician. He worked both as an algebraist and a number theorist and later worked as cryptanalyst at Pers Z S, the German Foreign Office cipher bureau, during World War II. He was latterly known as the person who broke the American diplomatic O-2 cypher, a variant of the M-138-A strip cipher during 1943. Rohrbach wrote a report on the breaking of the strip cypher when he was captured by TICOM, the allied effort to roundup and seize captured German intelligence people and material.

27 February 1903

Born on the same birth date (27 February 1903): Joseph B. Soloveitchik • Reginald Gardiner

Born on the same birth day (27 February): André Leducq • Danny Antonucci • Iain Ramsay • Irving Fisher • Min Phalaung • Miyagiyama Fukumatsu • William Sherard

Born in the same month (February 1903): Douglas Douglas-Hamilton, 14th Duke of Hamilton • Edgar Bergen • Georgy Beriev • Giulio Natta • Greta Keller • Joan Whitney Payson • Jorge Basadre • Joseph B. Soloveitchik • Matthias Sindelar • Nikolai Podgorny • Orde Wingate • Reginald Gardiner • Vladimir Bartol • Waldemar Hoven