Cryptographical methods and means, number-theoretic algorithms in cryptography, computational complexity of algorithms.
Main publications:
T. A. Chalkin, K. M. Voloshchuk, “Development of bundled software for analysis of number-theoretic algorithms applicable in cryptography”, Contemporary problems of aviation and cosmonautics, 2008
V. U. Zolotukhin, T. A. Chalkin, “Development of estimation method for the dependence of GOST 28147-89 cipher security on selected key information”, Prikl. Diskr. Mat., 2010, no. supplement № 3, 20–21