This book constitutes the refereed proceedings of the 4th International
Conference on Principles of Security and Trust, POST 2015, held as part
of the European Joint Conferences on Theory and Practice of Software,
ETAPS 2015, in London, UK, in April 2015. The 17 regular papers
presented in this volume were carefully reviewed and selected from 57
submissions. In addition, one invited talk is included. The papers have
been organized in topical sections on information flow and security
types, risk assessment and security policies, protocols, hardware and
physical security and privacy and voting.