Head of the direction: "Theory, methods and tools of Boolean functional transformations". Development of the direction: - for the creation of cryptographic means of information protection; - construction and use of nonlinear codes for detecting and correcting data transmission errors; - improvement of hash addressing technology to increase the efficiency of memory search. Fundamental research is being conducted into the properties of Boolean functions and cryptographic transformations based on them. Thus, fundamentally important results in the field of the theory of differentiation of Boolean functional transformations and differential levels have been obtained for assessing the quality of cryptographic algorithms.