Identity-based Key Agreement Protocols From Pairings

L.  Chen; Z.  Cheng; N. P.  Smart

Paper 2006/199

Identity-based Key Agreement Protocols From Pairings

L. Chen, Z. Cheng, and N. P. Smart

Abstract

In recent years, a large number of identity-based key agreement protocols from pairings have been proposed. Some of them are elegant and practical. However, the security of this type of protocols has been surprisingly hard to prove. The main issue is that a simulator is not able to deal with reveal queries, because it requires solving either a computational problem or a decisional problem, both of which are generally believed to be hard (i.e., computationally infeasible). The best solution of security proof published so far uses the gap assumption, which means assuming that the existence of a decisional oracle does not change the hardness of the corresponding computational problem. The disadvantage of using this solution to prove the security for this type of protocols is that such decisional oracles, on which the security proof relies, cannot be performed by any polynomial time algorithm in the real world, because of the hardness of the decisional problem. In this paper we present a method incorporating a built-in decisional function in this type of protocols. The function transfers a hard decisional problem in the proof to an easy decisional problem. We then discuss the resulting efficiency of the schemes and the relevant security reductions in the context of different pairings one can use. We pay particular attention, unlike most other papers in the area, to the issues which arise when using asymmetric pairings.

Note: Minor clarifications added

Metadata

Available format(s): PDF PS
Category: Cryptographic protocols
Publication info: Published elsewhere. Unknown where it was published
Keywords: ID Based Key Agreement Protocols
Contact author(s): nigel @ cs bris ac uk
History: 2006-08-23: last of 2 revisions; 2006-06-20: received; See all versions
Short URL: https://ia.cr/2006/199
License: CC BY

BibTeX

@misc{cryptoeprint:2006/199,
      author = {L.  Chen and Z.  Cheng and N. P.  Smart},
      title = {Identity-based Key Agreement Protocols From Pairings},
      howpublished = {Cryptology {ePrint} Archive, Paper 2006/199},
      year = {2006},
      url = {https://eprint.iacr.org/2006/199}
}