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Autre Publication Année : 2008

Oracle-Assisted Static Diffie-Hellman Is Easier Than Discrete Logarithms

Résumé

This paper extends Joux-Naccache-Thomé's e-th root algorithm to the static Diffie-Hellman problem (sdhp). The new algorithm can be adapted to diverse finite fields by customizing it with an nfs-like core or an ffs-like core. In both cases, after a number of sdhp oracle queries, the attacker builds-up the ability to solve new sdhp instances unknown before the query phase. While sub-exponential, the algorithm is still significantly faster than all currently known dlp and sdhp resolution methods. We explore the applicability of the technique to various cryptosystems. The attacks were implemented in F_{2^1025} and also in F_p, for a 516-bit p.
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Dates et versions

inria-00337753 , version 1 (08-11-2008)
inria-00337753 , version 2 (17-11-2009)

Identifiants

  • HAL Id : inria-00337753 , version 1

Citer

Antoine Joux, Reynald Lercier, David Naccache, Emmanuel Thomé. Oracle-Assisted Static Diffie-Hellman Is Easier Than Discrete Logarithms. 2008. ⟨inria-00337753v1⟩
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