Detection of malicious traffic is based on its input data, the information that is co-ming from network-based monitoring systems. Best detection rates would only be possible by monitoring all data transferred over all network lines in a distributed net-work. Monitoring and reporting this amount of data are feasible in neither today's, nor will be in future's systems. Later analysis like stateful inspection of the traffic imposes even more processing costs. But only at this level of monitoring

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... d analysis there may be a chance to capture all attacks inside a system. So there needs to be a trade-off between detection success and the processing costs.