Breaking Generalized Diffie-Hellmann Modulo a Composite is no Easier Than Factoring

  title={Breaking Generalized Diffie-Hellmann Modulo a Composite is no Easier Than Factoring},
  author={Eli Biham and Dan Boneh and Omer Reingold},
  journal={Inf. Process. Lett.},
The Diffie-Hellman key-exchange protocol may naturally be extended to k > 2 parties. This gives rise to the generalized Diffie-Hellman assumption (GDH-Assumption). Naor and Reingold have recently shown an efficient construction of pseudo-random functions and proved its security based on the GDH-Assumption. In this note, we prove that breaking this assumption modulo a so called Blum-integer would imply an efficient algorithm for factorization. Therefore, both the key-exchange protocol and the… CONTINUE READING
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