An Attack on the Identity-Based Key Agreement Protocols in Multiple PKG Environment

JoongHyo OH  SangJae MOON  Jianfeng MA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E89-A   No.3   pp.826-829
Publication Date: 2006/03/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e89-a.3.826
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Information Security
identity-based cryptosystem,  key agreement protocol,  bilinear map,  multiple PKG,  implicit key authentication,  

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Lee et al. recently proposed the first identity-based key agreement protocols for a multiple PKG environment where each PKG has different domain parameters in ICCSA 2005. However, this letter demonstrates that Lee et al.'s scheme does not include the property of implicit key authentication which is the fundamental security requirement, making it vulnerable to an impersonation attack.