Dear CRITIS Community and CI(I)P Community in general, The International Conference on Critical Information Infrastructures Security (CRITIS 2017) reaches its 12th anniversary this year. After several successful editions in the past, CRITIS continues the tradition of presenting innovative research and exploring new challenges in the field of critical (information) infrastructures protection (C(I)IP) and fostering the dialogue with stakeholders. The event will take place in Lucca from Oct 9th to 11th with the following thematic sessions: CS Cyber Security HF Human Factors TR Transport EM Emergency Management UR Urban Resilience IS Trust and Information Sharing Together with CRITIS, and in the line with the tradition, Satellite Workshops with take place just after the main conference, from Oct 12th to 13th. Moreover, apart from the traditional sessions where original works and significant improvements will be presented, there will be other sessions devoted to Ongoing Projects and Operators. Given this, we invite to participate in where the event will serve to meet and exchange ideas and concerns with experts in the field. For any other information of the event, do not hesitate to check the official website at: http://www.critis2017.org Looking forward to seeing you at CRITIS 2017! Yours sincerely, Programme Chairs