说明：  本书的特色是网络安全理论知识与实例代码完美的结合，使读者不仅可以从理论深度上对网络安全有宏观的认识，而且可以根据实例代码对网络安全措施有更直观的把握。
(The book features network security theory of knowledge and example code is a perfect combination, so that readers not only from the theoretical depth network security macro, and example code more intuitive grasp of network security measures. )