为了提高入侵检测系统对入侵行为的速度和检测率，需要引入更好的算法或者对现有的算法进行改进。入侵检测要求能够快速准确地检测出各种入侵行为，因此对算法的执行效率问题要求较高。文中介绍了决策树中的两个经典算法：ID3算法和C4.5算法，分析了它们存在的问题以及寻找如何将改进的决策树算法应用在入侵检测中，并把它们进行了适当的改进以得到更好的效果。通过实验仿真验证了改进的这两种算法在入侵检测系统中对于发现入侵行为能够达到预期的结果。%In order to improve the speed and detection rate of the intrusion detection system for detecting the intrusion,need to introduce better algorithms or improve the existing algorithms. Intrusion detection requires the ability to quickly and accurately detect a variety of in-trusion,so the efficiency of the algorithm requires the higher. It describes two classical algorithms of the decision-making tree:ID3 algo-rithm and C4. 5 algorithm,and analyzes their problems and ways to apply them to intrusion detection. Make some appropriate improve-ments to them in order to get better results. The experimental simulation verifies that these two improved algorithms can achieve the ex-pected results in discovering the intrusion in the intrusion detection system.
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