Evaluation of the Possibility of Realizing the Crime of the Information System at Different Stages of TCP/IP

The article presents the main classical models of information systems security. It gives them a description—a statistical analysis of attempts to implement information threats in information systems with open architecture. The simulation of the probability of realization of information threats at different TCP/IP protocol stack levels is carried out; the simulation results are analyzed. As a result of the simulation, the values of the statistical probability of the realization of information threats in the IS for each layer of the TCP/IP protocol stack are obtained. It is established that the obtained values of the statistical probability of information threats, in general, coincide with theoretical values, which gives grounds to assert sufficient accuracy of the approximation and its applicability to assess the statistical probability of information threats at different levels of the TCP/IP protocol stack.