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Most present symmetric encryption algorithms result from a tradeoff between implementation cost and resulting performances. In addition , they generally aim to be implemented efficiently on a large variety of platforms. In this paper, we take an opposite approach and consider a context where we have very limited processing resources and throughput(More)
system to date has served all of the needs of wearable computing—light weight, minimum effort, high power generation, convenient power delivery, and good power regulation. We believe that our approach has the potential to solve these problems for a class of wearable devices by placing both the generator and powered electronics in a location where(More)
Preface This book is the result of an unsuccessful joke. During the summer of 1990, we were both participating in the Complex Systems Summer School of the Santa Fe Institute. Like many such programs dealing with " complexity, " this one was full of exciting examples of how it can be possible to recognize when apparently complex behavior has a simple(More)
Network protocols in layered architectures have historically been obtained on an ad hoc basis, and many of the recent cross-layer designs are conducted through piecemeal approaches. They may instead be holisti-cally analyzed and systematically designed as distributed solutions to some global optimization problems. This paper presents a survey of the recent(More)
Low frequency electric fields provide a means to build contact and non-contact user interfaces that are unobtrusive, responsive, inexpensive, and simple to configure. In this paper, we outline the theory and implementation of such sensing techniques, contrasting them with more familiar alternatives. We then present a range of applications that we have(More)
While wearable computers are empowering fashion accessories, they bring with them a tangle of wires which connect their parts. As these subsystems begin to decouple and operate on less power, it becomes possible to wirelessly distribute their required data and power using to the wearer's body. We have demonstrated systems that transmit and receive both data(More)