|Birthname||Johannes Joachim Albert Rohrbach|
|born on||27 February 1903 at 18:30 (= 6:30 PM )|
|Place||Berlin-Schöneberg, Germany, 52n28, 13e22|
|Timezone||MET h1e (is standard time)|
|Astrology data||07°58' 11°24 Asc. 17°38'|
German mathematician who 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.
He died on 19 December 1993, aged 90, in Bischofsheim an der Rhön, Bavaria.
Sy Scholfield provided birth registry entry from Berlin archives.
- Personal : Death : Long life more than 80 yrs (Age 90)
- Vocation : Science : Mathematics/ Statistics (Algebraist, number theorist, cryptanalyst)
- Notable : Famous : Historic figure (Broke the American diplomatic O-2 cypher)