SECRYPT is an annual international conference covering research in information and communication security. The 15th International Conference on Security and Cryptography (SECRYPT 2018) will be held in Porto, Portugal on 26-28 July 2018. The conference seeks submissions from academia, industry, and government presenting novel research on all theoretical and practical aspects of data protection, privacy, security, and cryptography. Papers describing the application of security technology, the implementation of systems, and lessons learned are also encouraged. Papers describing new methods or technologies, advanced prototypes, systems, tools and techniques and vision papers indicating future directions are also encouraged.