Cryptology ePrint Archive: Report 2006/321

Efficient Pseudorandom Generators Based on the DDH Assumption

Reza Rezaeian Farashahi and Berry Schoenmakers and Andrey Sidorenko

Abstract: A family of pseudorandom generators based on the decisional Diffie-Hellman assumption is proposed. The new construction is a modified and generalized version of the Dual Elliptic Curve generator proposed by Barker and Kelsey. Although the original Dual Elliptic Curve generator is shown to be insecure, the modified version is provably secure and very efficient in comparison with the other pseudorandom generators based on discrete log assumptions.

Our generator can be based on any group of prime order provided that an additional requirement is met (i.e., there exists an efficiently computable function that in some sense enumerates the elements of the group). Two specific instances are presented. The techniques used to design the instances, for example, the new probabilistic randomness extractor are of independent interest for other applications.

Category / Keywords: Pseudorandom generator, DDH problem, concrete security

Date: received 25 Sep 2006, last revised 7 Nov 2006

Contact author: a sidorenko at tue nl

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Version: 20061107:145524 (All versions of this report)

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