Expert system: it can describe the rules of a given case of intrusion, the security of the system state reasoning. Under normal circumstances, a strong detection expert system, flexibility is also high, but the high computational cost, usually to reduce the cost of execution speed. String matching: it is transferred between the system through the system itself or the text generated to achieve substring matching. Due to poor flexibility of the method, but easy to understand, there are many efficient algorithms, their implementation is fast. Based on the simple rule: similar to expert systems, but relatively simple, so fast execution.
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