On Security Notions for Verifiable Encrypted Signature

Xu-An Wang; Xiaoyuan Yang; Yiliang Han

Paper 2008/098

On Security Notions for Verifiable Encrypted Signature

Xu-An Wang, Xiaoyuan Yang, and Yiliang Han

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.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Published elsewhere. Unknown where it was published
Contact author(s): wangxahq @ yahoo com cn
History: 2008-05-21: revised; 2008-03-10: received; See all versions
Short URL: https://ia.cr/2008/098
License: CC BY

BibTeX

@misc{cryptoeprint:2008/098,
      author = {Xu-An Wang and Xiaoyuan Yang and Yiliang Han},
      title = {On Security Notions for Verifiable Encrypted Signature},
      howpublished = {Cryptology {ePrint} Archive, Paper 2008/098},
      year = {2008},
      url = {https://eprint.iacr.org/2008/098}
}