This book constitutes the refereed proceedings of the International Conference on Trusted Systems, INTRUST 2012, held in London, UK, in December 2012. The 6 revised full papers presented together with 3 short invited papers and a short paper which formed the basis for a panel session were carefully reviewed and selected from 19 submissions. The papers are organized in topical section on automated analysis, security and trust, mobile trust, security of distributed systems, evaluation and analysis, and embedded security.