Cryptography plays a crucial role in many aspects of today's world, from internet banking and ecommerce to email and web-based business processes. Understanding the principles on which it is based is an important topic that requires a knowledge of both computational complexity and a range of topics in pure mathematics. This book provides that knowledge, combining an informal style with strong proofs of the key results to provide an accessible introduction. It includes many examples and exercises, and is based on a highly successful course developed and taught over many years.

密码学在当今世界的许多方面起着至关重要的作用，从网上银行和电子商务到电子邮件和基于网络的业务流程。理解它所基于的原理是一个重要的主题，它需要对计算复杂性和纯数学中的一系列主题的知识。这本书提供了这些知识，结合了非正式的风格和对关键结果的有力证明，提供了一个易于理解的介绍。它包括许多例子和练习，并基于多年来开发和教授的一门非常成功的课程。