Cryptology ePrint Archive: Report 2004/174

Short Group Signatures

Dan Boneh and Xavier Boyen and Hovav Shacham

Abstract: We construct a short group signature scheme. Signatures in our scheme are approximately the size of a standard RSA signature with the same security. Security of our group signature is based on the Strong Diffie-Hellman assumption and a new assumption in bilinear groups called the Decision Linear assumption. We prove security of our system, in the random oracle model, using a variant of the security definition for group signatures recently given by Bellare, Micciancio, and Warinschi.

Category / Keywords: public-key cryptography / group signatures

Publication Info: An extended abstract appears in CRYPTO 2004.

Date: received 20 Jul 2004, last revised 3 Sep 2004

Contact author: eprint at boyen org

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Version: 20040903:200430 (All versions of this report)

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