Kerckhoffs' principle for intrusion detection

One of the basic principles of cryptography is that the security of a system must depend not on keeping secret the algorithm, but only the key. This principle is known as Kerckhoffs' Principle. In this paper we propose application of this principle in intrusion detection systems. The fact that attackers know the intrusion detection algorithm will not help them if there is a secret key for each implementation that makes it different enough from the others. Implementation of network packet payload anomaly detection IDS that enables application of the idea is presented. Results for various keys confirm excellent detection capabilities. Proof of concept mimicry attack protection example is provided.