Cryptology ePrint Archive: Report 2004/315

Security Arguments for Partial Delegation with Warrant Proxy Signature Schemes

Qin Wang, Zhenfu Cao

Abstract: Proxy signature is an important cryptographic primitive and has been suggested in numerous applications. In this paper, we present an attack on the aggregate-signature-based proxy signature schemes, then point out there are two flaws in BPW notion of security for proxy signature. Furthermore, we give arguments for partial delegation with warrant proxy signature schemes. We construct a new proxy signature scheme and prove that it is secure against existentially forgery on adaptively chosen-message attacks and adaptively chosen-warrant attacks under the random oracle model.

Category / Keywords: public-key cryptography / digital signature, proxy signature, partial delegation with warrant, provable security.

Date: received 17 Nov 2004

Contact author: chhwangqin at sjtu edu cn, cao-zf@cs sjtu edu cn

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Version: 20041117:100742 (All versions of this report)

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