Paper 2008/373
Analysis and Improvement of Authenticatable Ring Signcryption Scheme
Fagen Li, Masaaki Shirase, and Tsuyoshi Takagi
Abstract
Ring signcryption is an anonymous signcryption which allows a user to anonymously signcrypt a message on behalf of a set of users including himself. In an ordinary ring signcryption scheme, even if a user of the ring generates a signcryption, he also cannot prove that the signcryption was produced by himself. In 2008, Zhang, Yang, Zhu, and Zhang solve the problem by introducing an identity-based authenticatable ring signcryption scheme (denoted as the ZYZZ scheme). In the ZYZZ scheme, the actual signcrypter can prove that the ciphertext is generated by himself, and the others cannot authenticate it. However, in this paper, we show that the ZYZZ scheme is not secure against chosen plaintext attacks. Furthermore, we propose an improved scheme that remedies the weakness of the ZYZZ scheme. The improved scheme has shorter ciphertext size than the ZYZZ scheme. We then prove that the improved scheme satisfies confidentiality, unforgeability, anonymity and authenticatability.
Metadata
- Available format(s)
-
PDF
PS
- Category
- Public-key cryptography
- Publication info
- Published elsewhere. Journal of Shanghai Jiaotong University (Science)
- Keywords
- Identity-based cryptographybilinear pairingsring signcryptionring signature
- Contact author(s)
- fagenli @ uestc edu cn
- History
- 2009-04-08: last of 3 revisions
- 2008-09-01: received
- See all versions
- Short URL
- https://ia.cr/2008/373
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2008/373,
author = {Fagen Li and Masaaki Shirase and Tsuyoshi Takagi},
title = {Analysis and Improvement of Authenticatable Ring Signcryption Scheme},
howpublished = {Cryptology {ePrint} Archive, Paper 2008/373},
year = {2008},
url = {https://eprint.iacr.org/2008/373}
}
