The International Conference on Risks and Security of Internet and Systems 2020 will be the 15th in a series dedicated to security issues in Internet-related applications, networks, and systems. The Internet has become essential for the exchange of information between user groups and organizations from different backgrounds and with different needs and objectives. These users are exposed to increasing risks regarding security and privacy, due to the development of more and more sophisticated online attacks, the growth of Cyber Crime, etc. Attackers nowadays do not lack motivation and they are more and more experienced.