Paper 2008/098 Original: eprint.iacr.org/2008/098 ↗
On Security Notions for Verifiable Encrypted Signature
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
- Preprint.
- History
- 2008-05-21: last updated
- 2008-03-10: published
- Short URL
- https://ia.cr/2008/098
- License
- https://creativecommons.org/licenses/by/4.0/
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}
}