Ubiquitous computing refers to computers embedded in everyday devices communicating with each other over ad-hoc wireless networks Focuses on two very hot topics: ad-hoc wireless networking and security Covers security issues for well-established and widely used technologies such as GSM, Bluetooth, and IP Presents a framework to make sense of the many and varied issues at stake, a taxonomy of the major problems and in-depth discussion of some specific, cutting-edge solutions Includes a primer on security and the basics of cryptography Describes the security issues in "peer-to-peer networking," a new technology that is gaining prominence in the media with applications such as Napster and ICQ Chat