[Resource Topic] 2004/280: Cryptanalysis of Park-Lee Nominative Proxy Signature Scheme

Welcome to the resource topic for 2004/280

Title:
Cryptanalysis of Park-Lee Nominative Proxy Signature Scheme

Authors: 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.

ePrint: https://eprint.iacr.org/2004/280

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