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Paper: On the Authentication of One Popular Signcryption Scheme

Authors:
Zhengjun Cao
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URL: http://eprint.iacr.org/2007/372
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Abstract: Whether a recipient \textit{can prove} a signature to others is of great importance. The function is just one reason that we call a signature ``signature" rather than others. In this paper, we point out that one popular signcryption signature convinces \textit{only} the designated document's recipient that the signer deliberately signed the document. The \textit{designated recipient} can \textit{check} the validity of a given signcryptext but \textit{cannot prove} it to others. We also improve it using the efficient technique developed in Schnorr's signature instead of a zero-knowledge proof such that the receiver can \textit{check} the validity of a given signcryptext and \textit{can prove} it to a third party.
BibTeX
@misc{eprint-2007-13652,
  title={On the Authentication of One Popular Signcryption Scheme},
  booktitle={IACR Eprint archive},
  keywords={cryptographic protocols / signcryption,  universal authentication, restrictive authentication, designated authentication},
  url={http://eprint.iacr.org/2007/372},
  note={ caozhj@shu.edu.cn 13772 received 15 Sep 2007},
  author={Zhengjun Cao},
  year=2007
}