Cryptology ePrint Archive: Report 2004/257

A Weakness in Jung-Paeng-Kim's ID-based Conference Key Distribution Scheme

Junghyun Nam, Seungjoo Kim, and Dongho Won

Abstract: Very recently, Jung, Paeng and Kim [IEEE Communications Letters, Vol 8, No 7, pp 446--448, July 2004] have demonstrated the insecurity of Xu and Tilborg's ID-based conference key distribution scheme, and in addition, have revised the scheme to fix the security flaws discovered by them. However, in this paper, we show that Jung-Paeng-Kim's revised scheme is still insecure since it is vulnerable to an active attack of colluding adversaries. We also show that our attack can be easily thwarted by a simple patch.

Category / Keywords: cryptographic protocols / Conference key distribution; active attack; colluding adversaries.

Date: received 5 Oct 2004, last revised 7 Dec 2004

Contact author: jhnam at dosan skku ac kr

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Version: 20041207:131418 (All versions of this report)

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