Starting with early prototypes and proposed applications, this book surveys the longer history of amplifying small amounts of hardware security into broader system security - and reports real case study experience with security architecture and applications on multiple types of platforms. The author examines the theory, design, and implementation of the IBM 4758 secure coprocessor platform and discusses real case study applications that exploit the unique capabilities of this platform. The author discusses how these foundations grow into newer industrial designs, and discusses alternate architectures and case studies of applications that this newer hardware can enable. The author closes with an examination of more recent cutting-edge experimental work in this area.