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Paper: Cryptanalysis of Park-Lee Nominative Proxy Signature Scheme

Authors:
Zhengjun Cao
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URL: http://eprint.iacr.org/2004/280
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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.
BibTeX
@misc{eprint-2004-12246,
  title={Cryptanalysis of Park-Lee Nominative  Proxy Signature Scheme},
  booktitle={IACR Eprint archive},
  keywords={cryptographic protocols /},
  url={http://eprint.iacr.org/2004/280},
  note={ zjcamss@hotmail.com 12720 received 28 Oct 2004},
  author={Zhengjun Cao},
  year=2004
}