On 25^th April 2017 the third and final ECOSSIAN workshop and Advisory Board meeting took place. The workshop was an affiliated event to the 2nd IEEE European Symposium on Security and Privacy EuroS&P 2017 in Paris and attracted approximately 30 participants. The aim of the workshop was to present the major outcomes of new technological as well as political concepts and dimensions with regards to critical infrastructure protection. The workshop included an introduction to the basic concepts of operational, organizational, legal and technical frameworks addressed by ECOSSIAN, while being guided by interactive discussions with a variety of highly motivated experts.