JISE

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Journal of Information Science and Engineering, Vol. 23 No. 3, pp. 897-909

Re-key Interval Optimization for Secure Group Communications

Goo-Yeon Lee, Choong-Kyo Jeong, Yong Lee^** and Hwa-Jong Kim
Department of Electrical and Computer Engineering
Kangwon National University
Chunchon, Kangwon-Do, 200-701, Korea
^**Wireless Networks Laboratory
School of Electrical Engineering
Cornell University
New York, 14853, U.S.A.

We investigate a model for re-keying in secure group communications and derive an expression of the total cost that takes into account both the cost for re-keying and the cost of key (and hence information) leakage. From this relation we can determine an optimal re-key interval for various choices of parameters under our cost model. Some numerical examples show our predictions to be apparently meaningful. Our results have practical implications when designing a practical scheme for secure group communications.

Keywords: re-key interval, secure group communication, key management, re-key cost, exposure cost

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