John Nash’s Letter to the NSA


The National Security Agency (NSA) has recently declassified an amazing letter 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, but they did not seem to be interested.


All in all, the letter anticipates computational complexity theory by a decade and modern cryptography by two decades.  Not bad for someone whose “best known work is in game theory”.


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