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On Security Notions for Verifiable Encrypted Signature
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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 }