This volume contains the papers presented at the Third International Conference on Security in Pervasive Computing (SPC 2006), held April 19-21, 2006 in York, UK. The conference focused on methods, tools, principles, and practices for assessing and achievingsecurityinapervasiveenvironment.Newsecurityconceptswerediscussed, in domains and applications such as handheld devices, mobile phones, smartcards, RFID chips, and smart labels, as well as new,...