This book constitutes the refereed proceedings of the Second International Conference on Security in Pervasive Computing, SPC 2005, held in Boppard, Germany in April 2005.The 14 revised full papers and 3 revised short papers presented together with abstracts of 5 invited talks were carefully reviewed and selected from 48 submissions. The papers are organized in topical sections on smart devices and applications, authentication, privacy and anonymity, and access control and information flow.