Compromised Communications Research

December 1941

According to Central Security Service, National Security Agency article "TheSigsaly" story by Patrick D. Weason, The Deutsche Reichpost had broken the only available secure communications technology in use in the United States, the AT&T A-3 scrambler system. The A-3 was used by then President Franklin D. Roosevelt.

Spring 1942

Reich Post Minister Wilhlelm Karl Ohnesorge's experts unscramble America-British high level trans-atlantic radiotelephone link (Roosevelt/Churchill).