Analytical method of the assessment of information security by criterion of availability of information to the solution of problems of creation of the protected distributed information systems

In the article is considered the problem of creation of steadily functioning territorially distributed information system on condition of impact on it of potentially possible destructive factors of technogenic and anthropogenous character. For the solution of practical problems of engineering design is offered the analytical model constructed on the basis of application of the mathematical theory of counts. In the article is given the analytical technique is stated and the example of its use for the solution of a specifi c objective.