re: #117 Decatur Deb

It also had a security vulnerability. The time delay from keystroke to the ball impact was unique for each character. Bad guys recording the sound could reconstruct its output by analyzing the delay. (Or so we were told.)

Fascinating, and obviously possible, because the starting position of the ball was always the same and each character was at a different angle and distance from the platen. Of course we’re talking about microseconds, but I suppose the Soviets had the technology.