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Submission + - An Inquisitive Mind: John Nash NSA Letters (nsa.gov)

Frosty Piss writes: The NSA recently declassified some amazing letters that John Nash sent to it in 1955. It seems that around the year 1950 Nash tried to interest some US security organs (the NSA itself was only formally formed only in 1952) in an encryption machine of his design. In the letters, Nash proposes that security of encryption be based on computational hardness, focusing on the distinction between polynomial time and exponential time computation — this is exactly the transformation to modern cryptography made two decades.

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