Cloud computing is today the reference paradigm for large-scale data storage and processing due to the convenient and efficient network access to configurable resources that can be easily adjusted according to users' needs. Although the benefits of cloud computing are tremendous, security and privacy concerns have still a detrimental impact on the adoption and acceptability of cloud services. In fact, users as well as companies that rely on cloud storage and computation services lose the direct control over the systems managing their data and applications, thus putting the confidentiality, integrity, and availability of the data at risk. The goal of this workshop is to bring together researchers and practitioners who are interested in discussing the security, privacy, and data protection issues emerging in cloud scenarios, and possible solutions to them. The 1st IEEE SPC 2015 will be held in Florence, Italy, in conjunction with the IEEE Conference on Communications and Network Security