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The actual problem of information security is achieved by using a variety of methods and technologies. The level of information protection depends on the quality of the methods used. The article deals with information security problems, and provides a classification and analysis of clustering algorithms. The clustering methods considered during the classification process have certain advantages and disadvantages, the correct choice of which ensures their effective application in solving specific problems. Clustering methods k-means and k-medians in most cases give better results with the right choice of clustering criteria. These methods are simple, contain a small number of calculations, and avoid the problem of sensitivity to the initial choice of cluster centers. It also makes sense to use fuzzy clustering if cluster elements cannot be clearly assigned to one of the clusters.

The technique of the discrete control of a continuous object is considered by the example of a DC motor. The proposed method can simplify the procedure of selecting the desired properties of the synthesized control system, and reduce the control identification to a standard problem on the linear equation system solution with regard to the inequality constraints at each sample spacing. The desired properties of the synthesized system are specified through the reference transient. The quadratic performance criterion that characterizes the deviation of the transition process from the reference at the equally separated moments of time is applied. This approach allows a real-time control of the object with account to the restrictions of both to the controlling action, and to the phase control system coordinates. Thus, it is possible to achieve absence of overshoot and oscillability.