This book examines the issue of security across the logical layers of a network embedded system - adopting both technological and sociological perspectives. The authors take a holistic approach to discussing security in network embedded systems built on widespread experience from research projects and practical deployments, involving authors from both academic and industrial backgrounds. The book concentrates on the main problem of technology - how to make it acceptably secure. This problem is considered from different perspectives, such as technical, social, ethical, etc. The authors consider potential solution on different levels (application, network, middleware, etc). Written to educate potential developers and researchers in the area of ubiquitous computing, this book informs about the real issues in security as viewed from a systematic perspective, with further issues in social acceptability as a natural consequence of the nature of the technology - this is essential reading for graduates and practitioners.