Paper 2008/342
Cryptanalysis of Li et al.'s Identity-Based Threshold Signcryption Scheme
S. Sharmila Deva Selvi, S. Sree Vivek, Neha Jain, and Pandu Rangan Chandrasekaran
Abstract
Signcryption is a cryptographic primitive that aims at providing confidentiality and authentication simultaneously. Recently in May 2008, a scheme for identity based threshold signcryption was proposed by Fagen Li and Yong Yu. They have proved the confidentiality of their scheme and have also claimed the unforgeability without providing satisfactory proof. In this paper, we show that in their signcryption scheme the secret key of the sender is exposed(total break) to the clerk during sincryption and hence insecure in the presence of malicious clerks. Further, we propose a corrected version of the scheme and formally prove its security under the existing security model for signcryption.
Note: Submitted to TSP '08
Metadata
- Available format(s)
-
PDF
PS
- Category
- Public-key cryptography
- Publication info
- Published elsewhere. Unknown where it was published
- Keywords
- CryptanalysisThreshold SigncryptionIdentity-BasedPairing
- Contact author(s)
- prangan55 @ gmail com
- History
- 2008-08-11: received
- Short URL
- https://ia.cr/2008/342
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2008/342,
author = {S. Sharmila Deva Selvi and S. Sree Vivek and Neha Jain and Pandu Rangan Chandrasekaran},
title = {Cryptanalysis of Li et al.'s Identity-Based Threshold Signcryption Scheme},
howpublished = {Cryptology {ePrint} Archive, Paper 2008/342},
year = {2008},
url = {https://eprint.iacr.org/2008/342}
}
