Efficient ID-based Signature Without Trusted PKG

Jingwei Liu; Rong Sun; Weidong Kou; Xinmei Wang

Paper 2007/135

Efficient ID-based Signature Without Trusted PKG

Jingwei Liu, Rong Sun, Weidong Kou, and Xinmei Wang

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: Published elsewhere. has NOT been published elsewhere
Keywords: ID-based Signature Key Escrow Gap Diffie-Hellman Group Bilinear Pairing Dishonest PKG
Contact author(s): jwliu @ mail xidian edu cn
History: 2007-04-18: received
Short URL: https://ia.cr/2007/135
License: CC BY

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}
}