Lada N. Methods and tools for synthesizing streaming encryption operations to within a permutation

The dissertation is devoted to the improvement of the quality of the systems of streaming encryption of confidential information at the expense of increasing the stability and reliability of the transformation based on the use of modified addition operations by the module two to within a permutation. For this purpose, symmetric and asymmetric modifications of cryptographic addition operations by the module two have been synthesized on the basis of experimental studies by combining matrix cryptographic algorithms with permutations of operands in operations. The complete group of modified operations of cryptographic addition by the module two to within a permutation on the basis of addition operations by the module two to within a permutation of operands, by combining matrix cryptographic algorithms with permutations of results of operations execution, has been synthesized and investigated. A method for increasing the stability and reliability of streaming encryption based on the application of the group of modified addition operations by the module two to within the permutation by the use of additional subdued sequence for the selection of operations at each stage of encryption has been developed.