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    • A Note on Cryptography and NP$\cap$ CoNP-P 

      Brassard, Giles; Fortune, Steven; Hopcroft, John E. (Cornell University, 1978-04)
      Diffie and Hellman [2] propose the use of the exponential function in a finite field for cryptographic purposes. The proposal is based on the conjecture that the inverse function, the logarithm, is not feasibly computable. ...