Cryptology, coding theory, discrete mathematics.

Algebra: Linear Algebra in Euclidean Spaces, Finite Fields; Geometry: Codes and Designs in Polynomial Metric Spaces, Packings and Coverings; Combinatorics: Orthogonal Arrays, t-Designs, Strongly Regular Graphs, Association Schemes – Spherical Designs, Designs in Projective Spaces; Coding Theory: Bounds for Codes, Optimal Codes.

Coding Theory: covering radii of codes, optimal codes, decoding, Computer communications: error control performance of codes, Combinatorics, Algorithms.