The system approach to solving problems of information security, proposed in this work provides for the integration of mathematical models of the processing and protection of information. This model connects invulnerability and flexibility for each of three aspects of security (confidentiality, availability and integrity) of information based on structural unification of these contradictions. The method of modeling the security policy (SP) to provide a highly reliable information processing (HRIP) has been developed. This method differs by using a new problem-based graph-theoretic unit of standard model of the protected automated system for connection flexibility the discretionary model with the principled security of models of the final states of the SP. The mathematical models of synthesis of policy safe interaction of information processes, allowing SP to consider separately the various structural components of network with the ability to its further interlinkages have been developed. Using the new mathematical models of flexible reliability, availability, confidentiality and integrity of information processed, allowing mathematically describe the mechanisms to ensure the availability and confidentiality of the information and take into account the quantitative requirements for data integrity.

The results of researches, allowing raising the level of protection of the automated data processing systems of critical applications and intellectual information systems of enterprises are presented in the article. The mathematical models and results of vulnerability estimation of information systems which have Internet connection through various communication channels are resulted in this work. The system approach to solving problems of information security, proposed in this work provides for the integration of mathematical models of the processing and protection of information. The method of modeling the security policy to provide a highly reliable information processing has been developed. The mathematical models of synthesis of policy safe interaction of information processes, allowing security policy to consider separately the various structural components of network with the ability to its further interlinkages have been developed. Using the new mathematical models of flexible reliability, availability, confidentiality and integrity of information processed, allowing mathematically describe the mechanisms to ensure the availability and confidentiality of the information and take into account the quantitative requirements for data integrity.

The article to contain results of the researches, allowing to raise level of protection of the automated and intellectual information systems of the motor transportation enterprises (AISTE) in the conditions of an intensification of transportations. The article also considers the issues of research and protection of the AISTE under the condition of several conflict data request threads. The system approach to solving problems of information security, proposed in this work provides for the integration of mathematical models of the processing and protection of information. This model connects invulnerability and flexibility for each of three aspects of security (confidentiality, availability and integrity) of information based on structural unification of these contradictions. In article results of researches on development of methods and models of intellectual recognition of threats to information systems of transport. The article to contain mathematical models and results of an estimation information systems having Internet connection through various communication channels.