Of course, that didn’t stop people trying to break them. During World War Two, the British realised that they could, in fact, decipher the messages – but they’d have to get their hands on the one-time pad that was used to encrypt them. “We discovered that the Russians used the out-of-date sheets of one-time pads as substitute toilet paper in Russian army hospitals in East Germany,” says Glees. Needless to say, British intelligence officers soon found themselves rifling through the contents of Soviet latrines.
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