SUMMARY
The use of spline approximation method for studying the information security problem tasks is considered in the article. The all possible technical channels of information leakage must be considered and researched for assessing information security. The universal analysis method of such processes is the method of statistical modeling. The critical problem is also software protection of network servers, where information threat detection is clearly statistical defined and it is solved by methods of probability theory and statistical decision theory. The information security process is considered as a service process of requirements flow for information security systems, caused by necessity of respond to information threats for the purpose of their prevention or neutralization. The necessity of calculating the correct threat detection probability for information is becoming. The method of spline approximation of empirical relationships is effective in this case. This method allows calculating probabilities data.