Probabilistic and deterministic analysis the security of information systems

In this article we compare probabilistic and deterministic approaches for estimating the security of information systems. Two parameters of security systems have been determined for compare - the ability to prevent unauthorized entry and deviation the requests with no permissions. Anylogic has been selected as a tool for modelling the information systems security. Two approaches have been used for design of a simulation model - context-roles and the protection of the perimeter. This allows us to develop the hybrid model and confirm its efficiency for comparison analysis the information systems security.