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Cryptanalysis of Park-Lee Nominative Proxy Signature Scheme
Authors: Zhengjun CaoAbstract:
Park and Lee have proposed a digital nominative proxy signature
scheme for mobile communication in . 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.
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