Abstract. The problem of improvement of information protection systems is analyzed on the base of an estimate for the efficiency of information threats combating process in large information systems. The process of combating of threats to an element of information system of an enterprise is represented as an aggregated time-operation model. A mathematical technique based on random variable distribution law is employed. An assessment of time costs correlation with the efficiency of information protection for separate information structures is presented. Efficiency of the process of previously unknown treats combating by an information protection system built on the adaptation principle is estimated. The adapting schema is shown to allow for reconstruction of the structure of information protection system depending on the impact nature.

Keywords: отражение информационных угроз, большие информационные системы, эффективность, операционно-временная модель, адаптация

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