Paper 2007/135 Original: eprint.iacr.org/2007/135 ↗
Efficient ID-based Signature Without Trusted PKG
Abstract
In this paper, we introduce the exact concept of ID-based signature without trusted Private Key Generator (PKG), which solves the key escrow problem through binding two partially public keys with a same identity. In this scheme, PKG is prevented from forging a legal user’s signature because he only generates the partially private key. Using Gap Diffie-Hellman (GDH) groups, we construct an efficient ID-based signature scheme without trusted PKG, which security relies on the hardness of the Computation Diffie-Hellman Problem (CDHP). More precisely, under the random oracle model, our scheme is proved to be secure against existential forgery on adaptively chosen message and ID attack, which is a natural ID-based version of the standard adaptively chosen message attack, assuming CDHP is intractable. Our scheme not only eliminates the inherent key escrow problem but also has a higher efficiency than the existing schemes.
Metadata
- Available format(s)
PDF- Category
- Public-key cryptography
- Publication info
- Preprint.
- History
- 2007-04-18: last updated
- 2007-04-18: published
- Short URL
- https://ia.cr/2007/135
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2007/135,
author = {Jingwei Liu and Rong Sun and Weidong Kou and Xinmei Wang},
title = {Efficient ID-based Signature Without Trusted PKG},
howpublished = {Cryptology {ePrint} Archive, Paper 2007/135},
year = {2007},
url = {https://eprint.iacr.org/2007/135}
}