This book constitutes the refereed proceedings of the Third International Conference on Security in Pervasive Computing, SPC 2006, held in York, UK, in April 2006. The 16 revised papers presented together with the extended abstract of 1 invited talk were carefully reviewed and selected from 56 submissions. The papers are organized in topical sections on protocols, mechanisms, integrity, privacy and security, information flow and access control, and authentication.

Invited Talk.- Trust Without Identification.- Protocols.- Constant-Round Password-Based Group Key Generation for Multi-layer Ad-Hoc Networks.- Enabling Secure Discovery in a Pervasive Environment.- Forward Secure Communication in Wireless Sensor Networks.- Mechanisms.- Low Rate DoS Attack to Monoprocess Servers.- Delegating Secure Logging in Pervasive Computing Systems.- Implementing Minimized Multivariate PKC on Low-Resource Embedded Systems.- Integrity.- Higher Dependability and Security for Mobile Applications.- Tampering with Motes: Real-World Physical Attacks on Wireless Sensor Networks.- Privacy and Security.- The Brave New World of Ambient Intelligence: An Analysis of Scenarios Regarding Privacy, Identity and Security Issues.- Profiles and Context Awareness for Mobile Users - A Middleware Approach Supporting Personal Security.- Privacy Sensitive Location Information Systems in Smart Buildings.- Silent Cascade: Enhancing Location Privacy Without Communication QoS Degradation.- Information Flow and Access Control.- Securing Information Gateways with Derivation-Constrained Access Control.- Information Flow Control to Secure Dynamic Web Service Composition.- Authentication.- Analysing a Biometric Authentication Protocol for 3G Mobile Systems Using CSP and Rank Functions.- Attribute-Based Authentication Model for Dynamic Mobile Environments.