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Re:New Directions in Cryptography by Diffie and Hellman (197... by cromulent on Friday July 08, 2016 @12:40AM (#12053593)
Also developed in parallel by GCHQ, but they didn't realize the potential and it was classified for 27 years:

https://en.wikipedia.org/wiki/Public-key_cryptography#Classi...

Re:New Directions in Cryptography by Diffie and Hellman (197... by dtemp on Friday July 08, 2016 @07:01AM (#12054658)
Or they knew exactly the potential but wanted to keep it to themselves.