Rethinking Public Key Infrastructures and Digital Certificates
Building in Privacy
Dr. Stefan Brands
From the Foreword:
This book provides new cryptographic communication and transaction techniques
so that users can limit the information provided to another party to a bare minimum.
The cryptographic techniques presented are novel and powerful. They are based
on familiar cryptographic foundations such as RSA and the discrete logarithm problem. Brands has invented fascinating new ways of representing certiﬁcates and credentials, and proves the security of his techniques using standard cryptographic assumptions.
Brands explains clearly how his new privacy-protecting techniques relate to electronic cash, public-key infrastructures, and smart cards. He also speaks eloquently
about the importance of privacy from a larger perspective, and argues against privacydefeating techniques such as “key escrow.”
This book, for both its conceptual framework and technical elaboration, is an
important landmark in the evolution of privacy-enhancing technology.