The structure and basic principles of technology for increasing the probability of identifying subjects of information processes of open Internet resources based on ontology methods are considered. Based on this ontology the knowledge base intended for creation of the program systems supporting ensuring information security has been realized.   The first step in building the domain theory is a formal description of the domain ontology, i.e. the meaning of all used terms specific to the given subject area. Cognitive ontology’s of subject areas are a tool necessary to achieve high pertinence of information retrieval and are needed to describe key concepts of a given subject area. The developed ontological knowledge base has been used when developing the software complex intended for identification of the user of social networks when ensuring information security, monitoring and preventing threats. This article is next in a series of articles by the authors in which they continue to monitor and analyze the current state and new tendencies in the field of information security and safety of information.