Desc: G - som i hemlig: Directed by Olle Häger. With Birgit Asp, Arne Beurling, Lennart Carleson, Ulla Flodkvist. About the Siemens Geheimschreiber - G printer - a crypto machine that Hitler's engineers designed in the 30's. The mathematician Arne Beurling at Uppsala University revealed the G-printer's secret.