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FWIW public-key cryptography was invented at GCHQ https://en.wikipedia.org/wiki/Clifford_Cocks …
It's close enough to academia I'm willing to give academia much of the credit: the useful (because public) parts came from Diffie, Hellmann, Merkle and RSA, as well as the inventors of ideas like hashing. And Cocks (& to some extent Ellis) were in any case a product of academia.
Incidentally, this earlier letter of John Nash's is rather remarkable: https://www.gwern.net/docs/cs/1955-nash …
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