Sharing of cyber-security related information is believed to greatly enhance the ability of organizations to defend themselves against sophisticated attacks. If one organization detects a breach sharing associated security indicators (such as attacker IP addresses, domain names, file hashes etc.) provides valuable, actionable information to other organizations. The analysis of shared security data promises novel insights into emerging attacks. Sharing higher level intelligence about threat actors, the tools they use and mitigations provides defenders with much needed context for better preparing and responding to attacks. In the US and the EU major efforts are underway to strengthen information sharing. 

Yet, there are a number of technical and policy challenges to realizing this vision. Which information exactly should be shared? How can privacy and confidentiality be protected? How can we create high-fidelity intelligence from shared data without getting overwhelmed by false positives? 

The 3rd Workshop on Information Sharing and Collaborative Security (WISCS 2016) aims to bring together experts and practitioners from academia, industry and government to present innovative research, case studies, and legal and policy issues. The workshop solicits original research papers in these areas, both full and short papers. Workshop proceedings will be published in the ACM Digital Library.