Cloud computing is nowadays a key enabling technology in the IT world. Adopting or moving to the cloud raises security concerns, spanning from confidentiality issues due to data outsourcing, to regulation and jurisdiction problems, which have been the focus of researchers and security solutions manufacturers in the past few years. Cloud computing effectively increased the attack landscape and brought security issues of its own. On the other hand, it also provided new means to deal with threats, and it constitutes an environment where fundamentally different information security approaches need to be devised, involving often a multidisciplinary effort in disciplines such as cryptography, networking, software development, system architecture, among others. This workshop aims to attract innovative research works and foster discussions addressing technical, policy and legal issues of information security, assurance and reliability in cloud computing environments, elaborating on distinguished and emerging topics that are of interest to both the academia and the industry.