The article discusses the concept of cybersecurity and its features, presents a list of US regulatory documents in the field of cyberspace and cybersecurity, as well as significant research and development work and programs in the field of development of cybersecurity technologies conducted by the Department of Advanced Research Projects of the US Department of Defense (DARPA). The most common foreign technologies used to protect computers, smart devices, routers, networks and cloud environments, as well as the main scientific and technological problems of the development of cybersecurity technologies, are summarized.