Optimizing security measures in an intrusion tolerant database system

  • Authors:
  • Toshikazu Uemura;Tadashi Dohi

  • Affiliations:
  • Department of Information Engineering, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, Japan;Department of Information Engineering, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, Japan

  • Venue:
  • ISAS'08 Proceedings of the 5th international conference on Service availability
  • Year:
  • 2008

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Abstract

In this paper we describe the stochastic behavior of an intrusion tolerant database (ITDB) system and quantitatively evaluate its security measures. More specifically, we develop a semi-Markov model and derive three security measures; system availability, system integrity and rewarding availability. By introducing an additional control parameter called the switching time, we develop secure control schemes of the ITDB, which maximize the respective security measures, and show numerically that the security measures can be improved by controlling the switching time.