TheCodeBreakers
Later
Pers z got a machine to shred the paper before it was incinerated. None
of the codesolving groups was allowed to know what the others were
doing—but these artificial barriers dissolved in the camaraderie of the
Dahlem bomb-shelter.
Security also meant political security, and even before the war the
Nazis planted a spy in Pers z to watch for any signs of anti-Hitler activity.
In 1942 Selchow became a Nazi. He took the honorary rank of
Sturmfiihrer, which gave him access to three of four cars. The next year
he became an Obersturmfiihrer because this gave him "a certain
authority with the drivers." However, he insisted, he never wore the
uniform. Among the cryptanalysts, Paschke, Schauffler, and Kunze, at
least, also joined the Nazi party.
The cryptanalysts' raw material was intercepted by either military
radio stations or the post office telegraph bureau. In Silesia, it came in by
courier about noon