[Resource Topic] 2005/111: Weak Composite Diffie-Hellman is not Weaker than Factoring

Welcome to the resource topic for 2005/111

Title:
Weak Composite Diffie-Hellman is not Weaker than Factoring

Authors: Kooshiar Azimian, Javad Mohajeri, Mahmoud Salmasizadeh

Abstract:

In1985, Shmuley proposed a theorem about intractability of Composite Diffie-Hellman [Sh85]. The Theorem of Shmuley may be paraphrased as saying that if there exist a probabilistic poly-time oracle machine which solves the Diffie-Hellman modulo an RSA-number with odd-order base then there exist a probabilistic algorithm which factors the modulo. In the other hand factorization of the module obtained only if we can solve the Diffie-Hellman with odd-order base. In this paper we show that even if there exist a probabilistic poly-time oracle machine which solves the problem only for even-order base and abstain answering the problem for odd-order bases still a probabilistic algorithm can be constructed which factors the modulo in poly-time for more than 98% of RSA-numbers.

ePrint: https://eprint.iacr.org/2005/111

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