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Paper: On Security Notions for Verifiable Encrypted Signature

Authors:
Xu-An Wang
Xiaoyuan Yang
Yiliang Han
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URL: http://eprint.iacr.org/2008/098
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Abstract: First we revisit three - BGLS, MBGLS and GZZ verifiably encrypted signature schemes[2,3,6].We find that they are all not strong unforgeable.We remark that the notion of existential unforgeable is not sufficient for fair exchange protocols in most circumstances.So we propose three new - NBGLS, MBGLS and NGZZ verifiably encrypted signature schemes which are strong unforgeable. Also we reconsider other two - ZSS and CA verifiably encrypted signature schemes[4,8], we find that they both cannot resist replacing public key attack. So we strongly suggest that strong unforgeable for verifiably encrypted signature maybe a better notion than existential unforgeable and checking adjudicator knowing its private key is a necessary step for secure verifiably encrypted signature scheme.
BibTeX
@misc{eprint-2008-17775,
  title={On Security Notions for Verifiable Encrypted Signature},
  booktitle={IACR Eprint archive},
  keywords={public-key cryptography /},
  url={http://eprint.iacr.org/2008/098},
  note={ wangxahq@yahoo.com.cn 14020 received 3 Mar 2008, last revised 21 May 2008},
  author={Xu-An Wang and Xiaoyuan Yang and Yiliang Han},
  year=2008
}