说明：  本书分分三个部分。第一部分描述密码学中的常用算法和数论算法，以及这些算法的C和C++程序实；第二部分描述密码算法的C和C++实现，主要包括RSA系统和替代DES的Rijindael算法。第三部分给出了书中C函数和C++函数的一览表及一些有用的网址。本书注重算法的实现以及密码算法与C和C++程序的结合，这也是本书的主要特色之一。从实用的角度来看，本书提供了一个可用于现代密码的完整软件包。书中除重点介绍了两种重要的密码算法之外，还涉及程序的检查及错误处理、密码策略及密码的前景等。
(Component three sections in the book. The first part describes the commonly used algorithms and theory of cryptography algorithm, and the algorithms of C and C++ program real The second part describes the password algorithm of C and C++ implementation, including RSA system and alternative Rijindael of DES algorithm. The third part presents the C and C++ functions in the book list and some useful website. This book focus on the realization of the algorithm and cryptographic algorithm and the combination of C and C++ program, which is one of the main features of this book. From a practical point of view, this book provides a modern passwords can be used for the complete package. Book in addition to focus on two important cryptographic algorithm, also involves the application of inspection and error handling, password policies and the prospect of the password. )