Abstract
This study discusses the problem distributed network attacks, formalized of model of linear kind for differentiate distributed network attacks on the basis of a weight coefficients Structured the formalized mathematical models allow to consider structure of the On network to a basis big percent, a measure of influence of each type of attack that gives the fine chance effectively to design to protect information system taking into account information on threats. Based on classification of information threats, characteristic for distributed network attacks it is offered the formalized models of a linear look for differentiation of attacks on the basis of a method of weight coefficients. By these indicators and coefficients it is possible to define the main types of threats in computer systems allowing to design effectively systems of information security taking into account information threats.