At present, cybersecurity has become one of the most important components of national security, and for its effective provision, it is necessary to assess the level of national cybersecurity. To solve this problem, some organizations proposed a number of national cybersecurity indices. However, research and practical work on the development of national cybersecurity indices are at an early stage, their methodological justification is unsatisfactory and incomplete. In this study, existing indices of national cybersecurity are comparatively analyzed, their advantages and disadvantages are indicated, and proposals are put forward for their improvement. For weights of indicators included in composite national cybersecurity indices, a method based on entropy is proposed. Static and dynamic cybersecurity indices are also proposed and an experimental verification of the proposed approaches is made on the basis of real data (pp.16-27).