Bardis N. Development of an approach and application of Boolean Functions tools to analysis and synthesis of effective Cryptographic algorithms of Information Security Systems.

The aim of the thesis is to develop an approach for analysis the level and to synthesis of cryptographic information security algorithms on the basis of Boolean function tool application. The identity of the problem of cryptograhic algorithm break^ with solution of a system of Boolean equations< which are determined by the algorithm has been shown. Criteria for evaluation of equivalent Boolean function system solution difficalty are wored out as well as means of their practical identification are presented. Method of Boolean function synthesis, which ensure a high level of cryptoresistance for the algorithms constructed on this basis are suggested. Verification of cryptoresistance of the most wodespead algorithms for information security have been carried out with application of above approach.