The Null Device

The NSA have released details of a top-secret encrypted digital telephony system, used by the Allies in WW2. The system used two turntables to hold the encryption key on vinyl records, synchronised with a clock two orders of magnitude more accurate than a modern consumer CD player. Some implementation details are still missing, though (such as the sampling rate used, the speed and capacity of the vinyl records, &c); though nonetheless, this is rather impressive.

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