The article identifies the main problems associated with the inconsistency and incoordination of such concepts as “information protection”, “information security”, “security of information”, “cybersecurity” and “cyber resilience”, which has led to the absence of a unified system currently accepted by the professional community concepts of the subject area under consideration. To overcome this flaw, it is proposed to build a basic system of concepts for the “security of objects in the information sphere (ISF)” subject area, based on taking into account the characteristics of objects (which using information technologies and processing information), using the ISF concept (as a collection of space of such objects and the environment of their interaction) and on the asset concept (part of an object that has a certain value), which can be main and auxiliary. Taking into account these initial data, the selected subject area is compared with three separate systems of concepts: “ensuring the security of information of objects in the ISF”, “ensuring the resilience of objects in the ISF” and “ensuring the information and psychological security of a person as an object’s asset in the ISF”. A description of the proposed systems of concepts is given, which can be attributed to the development of a methodological basis for ensuring the objects’ security. These conceptual systems have minimal overlap with each other and correspond to three separate areas of practical and scientific activity that require professionals with unique professional competencies. The results of the work have practical significance for the educational field in the formation of students' modern, methodologically sound conceptual base.