随着计算机和网络技术的不断发展,系统遭受的入侵和攻击也越来越多,入侵者的水平也越来越高,手段变得更加高明和隐蔽;而另一方面,现有的网络安全设备还没有一套很完备的测试方法。因此,网络与信息安全问题显得越来越突出,研究信息安全的攻防技术很有必要。 With the continuous development of computer and network technology, the system has suffered more and more invasions and attacks, and the intruders have become more sophisticated and sophisticated. On the other hand, the existing network security Equipment is not a very complete set of test methods. Therefore, the problem of network and information security is becoming more and more prominent. It is necessary to study offensive and defensive techniques of information security.