This book constitutes the refereed proceedings of six symposiums and two workshops co-located with SpaCCS 2019, the 12th International Conference on Security, Privacy, and Anonymity in Computation, Communication, and Storage. The 26 full papers were carefully reviewed and selected from 75 submissions. This year's symposiums and workshops are: SPIoT 2019 - Security and Privacy of Internet of Things; TSP 2019 - Trust, Security and Privacy for Emerging Applications; SCS 2019 - Sensor-Cloud Systems; UbiSafe 2019 - UbiSafe Computing; ISSR 2019 - Security in e-Science and e-Research; CMRM 2019 - Cybersecurity Metrics and Risk Modeling.

This book constitutes the refereed proceedings of the 12th International Conference on Security, Privacy, and Anonymity in Computation, Communication, and Storage, SpaCCS 2019, held in Atlanta, GA, USA in July 2019. The 37 full papers were carefully reviewed and selected from 109 submissions. The papers cover many dimensions including security algorithms and architectures, privacy-aware policies, regulations and techniques, anonymous computation and communication, encompassing fundamental theoretical approaches, practical experimental projects, and commercial application systems for computation, communication and storage.