  The approach for a network behavior description in terms of numerical
time-dependant functions of the protocol parameters is suggested. This provides
a basis for application of methods of mathematical and theoretical physics for
information flow analysis on network and for extraction of patterns of typical
network behavior. The information traffic can be described as a trajectory in
multi-dimensional parameter-time space with dimension about 10-12. Based on
this study some algorithms for the proposed intrusion detection system are
discussed.
