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An Analysis of the Vector Decomposition Problem

  • Steven D. Galbraith
  • Eric R. Verheul
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4939)

Abstract

The vector decomposition problem (VDP) has been proposed as a computational problem on which to base the security of public key cryptosystems. We give a generalisation and simplification of the results of Yoshida on the VDP. We then show that, for the supersingular elliptic curves which can be used in practice, the VDP is equivalent to the computational Diffie-Hellman problem (CDH) in a cyclic group. For the broader class of pairing-friendly elliptic curves we relate VDP to various co-CDH problems and also to a generalised discrete logarithm problem 2-DL which in turn is often related to discrete logarithm problems in cyclic groups.

Keywords

Vector decomposition problem elliptic curves Diffie-Hellman problem generalised discrete logarithm problem 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • Steven D. Galbraith
    • 1
  • Eric R. Verheul
    • 2
  1. 1.Mathematics DepartmentUniversity of LondonEghamUnited Kingdom
  2. 2.PricewaterhouseCoopers AdvisoryRadboud University NijmegenAmsterdamThe Netherlands

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