Cryptology is the art and science of secure communication over insecure
channels. The primary aim of this book is to provide a self-contained
overview of recent cryptologic achievements and techniques in a form
that can be understood by readers having no previous acquaintance with
cryptology. It can thus be used as independent reading by whoever wishes
to get started on the subject. An extensive bibliography of 250
references is included to help the reader deepen his or her
understanding and go beyond the topics treated here. This book can also
be used as preliminary material for an introductory course on
cryptology. Despite its simplicity, it covers enough state-of-the-art
material to be nevertheless of interest to the specialist. After a
survey of the main secret and public key techniques, various
applications are discussed. The last chapter describes 'quantum
cryptography', a revolutionary approach to cryptography that remains
secure even against an opponent with unlimited computing power. Quantum
crytography is based on the principles of quantum physics.