On the Strong Forward Secrecy of the Improved Chikazawa-Yamagishi ID-Based Key Sharing

Ik Rae JEONG  Jeong Ok KWON  Dong Hoon LEE  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E90-A   No.11   pp.2626-2628
Publication Date: 2007/11/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e90-a.11.2626
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Information Security
ID-based scheme,  conference key,  strong forward secrecy,  

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In this letter, we show that Jung's ID-based scheme, which is the improved version of the Chikazawa-Yamagishi scheme, satisfies only the weak forward secrecy. But the weak forward secrecy is not quite realistic, since it is not sufficient for modeling the real attacks. To address this problem, the strong forward secrecy has been pursued, which is modeling the more realistic attacks. We then suggest a modification of Jung's ID-based scheme to provide the strong forward secrecy.