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Journal of Inforamtion Science and Engineering, Vol.18 No.1, pp.125-139 (January 2002)

Two-Pass Hybrid Key Distribution Protocol Based on ECC

Sung-Min Lee and Tai-Yun Kim
Department of Computer Science and Engineering
Korea University
Seongbuk-gu, Seoul, Korea
E-mail: {smle, tykim}

In this paper we propose a two-pass hybrid key distribution and authentication protocol. The proposed protocol minimizes the number of message exchanges and the key management problem as it eliminates KDC, by using both symmetric-key and asymmetric-key schemes. In addition, it guarantees explicit entity and key authentication via a signature scheme based on elliptic curve cryptosystems (ECC) whose efficiency is superior to existing signature schemes with only two-message exchanges. As each entity has the same number of exponential operations, it also guarantees load balance among each entitys processing. We present proofs of security of our protocol using the formal methods Casper and FDR. The proposed protocol can be efficiently applied to various communication systems in distributed computing environments.

Keywords: key distribution, authentication, formal methods, ECC, security analysis

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Received December 27, 1999; revised April 23 & August 1, 2000; accepted October 5, 2000.
Communicated by Chi Sung Laih.