This volume contains the papers presented at POST 2019, the 8th Conference on Principles of Security and Trust, held April 11, 2019, in Prague, Czech Republic, as part of ETAPS. Principles of Security and Trust is a broad forum related to all theoretical and foundational aspects of security and trust, and thus welcomes papers of many kinds: new theoretical results, practical applications of existing foundational ideas, and innovative approaches stimulated by pressing practical problems; as well as systemization-of-knowledge papers, papers describing tools, and position papers. POST was created in 2012 to combine and replace a number of successful and long-standing workshops in this area: Automated Reasoning and Security Protocol Analysis (ARSPA), Formal Aspects of Security and Trust (FAST), Security in Concurrency (SecCo), and the Workshop on Issues in the Theory of Security (WITS). A subset of these events met jointly as an event affiliated with ETAPS 2011 under the name “Theory of Security and Applications” (TOSCA).

This book is included in DOAB.