Cryptology ePrint Archive: Report 2004/280

Cryptanalysis of Park-Lee Nominative Proxy Signature Scheme

Zhengjun Cao

Abstract: Park and Lee have proposed a digital nominative proxy signature scheme for mobile communication in [1]. They claimed that neither Origin signer nor Proxy agent can generate a valid signature solely. In this paper we show that Origin signer can generate a valid signature without the cooperation of the agent. In fact, the flaw comes from that Verifier dose not use the public key of Proxy agent in verifying phase. It's a serious designing error.

Category / Keywords: cryptographic protocols /

Date: received 28 Oct 2004

Contact author: zjcamss at hotmail com

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Version: 20041030:155540 (All versions of this report)

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