This book constitutes the refereed proceedings of the 9th International Workshop on Security and Trust Management, STM 2013, held in Egham, UK, in September 2013 - in conjunction with the 18th European Symposium Research in Computer Security (ESORICS 2013). distributed systems and physical security; authentication and security policies.

Privacy.- On Enhancement of ‘Share The Secret’ Scheme for Location Privacy.- New Attacks against Transformation-Based Privacy-Preserving Linear Programming.- Maintaining Database Anonymity in the Presence of Queries.- Network, Web, and Mobile Security.- A Probabilistic Framework for Distributed Localization of Attackers in MANETs.- MITHYS: Mind The Hand You Shake.- Evaluating the manageability of web browsers controls.- Security Protocols.- Using Interpolation for the Verification of Security Protocols.- RDAS: A Symmetric Key Scheme for Authenticated Query Processing in Outsourced Databases.- Security Policies and Trust Management.- Socio-Technical Study On the Effect of Trust and Context when Choosing WiFi Names.- Probabilistic Cost Enforcement of Security Policies.- Selective Disclosure in Datalog-based Trust Management.- Business Process Security.- Towards a Detective Approach to Business Process-centered Resilience.- IF-Net: A Meta-model for Security-oriented Process Specification.- Watermarking for Security.- Authenticity Control of Relational Databases by Means of Lossless Watermarking Based on Circular Histogram Modulation.- Weighted-Sum Fragile Watermarking in the Karhunen-Loève Domain.

This book constitutes the refereed proceedings of the 9th International Workshop on Security and Trust Management, STM 2013, held in Egham, UK, in September 2013 - in conjunction with the 18th European Symposium Research in Computer Security (ESORICS 2013).The 15 revised full papers including two invited talks were carefully reviewed and selected from 47 submissions. The papers are organized into topical sections on policy enforcement and monitoring; access control; trust, reputation, and privacy; distributed systems and physical security; authentication and security policies.