Information Technology for TTF Optimization of an Information System for Critical Use that Operates in Aggressive Cyber-Physical Space

The article proposes a new information technology for optimizing the time to failure of an information system for critical use (ISCU) that operates in an aggressive cyber-physical space. A characteristic feature of such space is the possibility of simultaneous influence on the target system of more than one deterministic negative factor (DNF). In contrast to the existing ones, the proposed technology describes in Markov's paradigm the interaction of set of DNFs and the target ISCU which counteracts their influence by the superposition of protection schemes. The formation of the superposition of protection schemes in the studied system is the responsibility of the information protection subsystem and protection schemes are defined in the system security policy. The information technology described in the article takes into account the architectural features of the class of ISCU in the analytical formalization of such reliability characteristics as the mean time to failure and the variance of the time to failure. On the basis of the received mathematical apparatus the statement of different tasks of synthesis of optimal superpositions of protection schemes of target system is carried out.