CryptoDB
Efficient ID-based Signature Without Trusted PKG
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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. |
BibTeX
@misc{eprint-2007-13417, title={Efficient ID-based Signature Without Trusted PKG}, booktitle={IACR Eprint archive}, keywords={public-key cryptography / ID-based Signature, Key Escrow, Gap Diffie-Hellman Group, Bilinear Pairing, Dishonest PKG}, url={http://eprint.iacr.org/2007/135}, note={has NOT been published elsewhere jwliu@mail.xidian.edu.cn 13621 received 17 Apr 2007}, author={Jingwei Liu and Rong Sun and Weidong Kou and Xinmei Wang}, year=2007 }