Eighty years ago this April, the first operational SIGSALY machine was built. Soon after, Selfridges of all places would have a direct line to the Pentagon
“The Germans employed listening posts, intercepting and breaking the A-3 scrambler with a simple oscilloscope”
The letter from President Franklin Roosevelt to Winston Churchill, recently named First Lord of the Admiralty, was congratulatory and struck a chord of co-operation. Indeed, it was a great step toward a partnership forged in opposition to the Axis powers that threatened the freedom of the world.