METHOD FOR MITIGATION OF CYBER ATTACKS ON INDUSTRIAL CONTROL SYSTEMS

摘要

Methods and systems for detecting a potential compromise of cyber security in an industrial network are disclosed. These methods and systems comprise elements of hardware and software for establishing a baseline of site-acceptable network behavior comprising a list of network states and transition probabilities, wherein a transition probability denotes an estimated probability of a first network state being followed temporally by a second network state during normal network operation; establishing a threshold representing tile probability below which a sequence of network states is anomalous; determining a probability for the occurrence of a sequence of network states as obtained from a particular stream of packets, according to the baseline of site-acceptable network behavior; and, taking protective action according to whether the determined probability is below the established threshold.