The lecture summary was prepared at the Department of ERP Systems and Business Processes of the Faculty of Applied Mathematics, Informatics and Mechanics of Voronezh State University . Recommended: for students of specialty 10. 05. 01 "Computer security"; for undergraduates of the 1st and 2nd courses of the full-time department of training directions: 01. 04. 02 Applied Mathematics and Computer Science ; Master's degree programs: Mathematical Foundations of Computer Graphics , Mathematical modeling , Numerical methods, optimization and optimal management , Mathematical and informational support of economic activity , Operations Research and Systems Analysis , Parallel Programming and Distributed Computing , mathematical and computer software. 02. 04. 04 Fundamental Informatics and Information Technology ; Master's programs: intelligent information technology, parallel programming and parallel computing, management information systems, system programming, programming for mobile devices, computer science