Cryptanalysis of Park-Lee Nominative  Proxy Signature Scheme

Zhengjun Cao

Paper 2004/280 Original: eprint.iacr.org/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.

Metadata

Available format(s): PDF
Category: Cryptographic protocols
Publication info: Preprint.
History: 2004-10-30: last updated; 2004-10-30: published
Short URL: https://ia.cr/2004/280
License: https://creativecommons.org/licenses/by/4.0/

BibTeX

@misc{cryptoeprint:2004/280,
      author = {Zhengjun Cao},
      title = {Cryptanalysis of Park-Lee Nominative  Proxy Signature Scheme},
      howpublished = {Cryptology {ePrint} Archive, Paper 2004/280},
      year = {2004},
      url = {https://eprint.iacr.org/2004/280}
}