Algebra and Number Theory, bent functions, Applied Mathematics, Shift register sequences and sequences over finite alphabets in information and communication theory, Perfect nonlinear functions, Applications of the theory of convex sets and geometry of numbers (covering radius, etc.) to coding theory, Algebraic coding theory; cryptography (number-theoretic aspects), nonlinearity, perfect nonlinear functions, S-boxes, linear codes, Theoretical Computer Science, Linear codes, Almost bent functions, almost bent functions, Bent functions, Nonlinearity, Engineering(all), Linear codes (general theory)