Norbert Ryska (born August 9, 1948, in Hau) is a German mathematician and museum director. Ryska worked from 1976 to 1992 as an employee of Nixdorf Computer...

Thürmer and Gerhard Diel, and a scientific team led by the mathematician Norbert Ryska. In the presence of the then Federal Chancellor Helmut Kohl, the museum...

in 2011 a document came into the hands of cryptographer-historian, Norbert Ryska, from the American special unit, Ticom (Target Intelligence Committee)...