The article aims at establishing the role of three different types of hackers in the domestic cyber space, policy and welfare, international relations and warfare of the Russian Federation compared to the situation in the world as for the beginning of 2020 year. The character and structure of hackers' participation in the information policy and cybersecurity are characterized in connection with the intensity and duration of their intervention, national interests, technical and political outcomes. The new role of cyberwarfare as the fifth sphere of military activity is highlighted and proved. Positive and negative influence of hackers' activities, methods of their detection and control on the level of an individual Internet user, company, government and international organization are differentiated. Examples of certain criminal groups of hackers' activities are given. Main organizational measures, tools and cryptography techniques for the protection against hackers' invasion are proposed. The article reveals and analyzes the specifics of various hacker attacks: white, gray and black. The article emphasizes that cybersecurity in the world is now the object of hacker attacks, which can affect the functioning of not only national or private corporations: but also, the work of government agencies.