Resumen
Fraud prevention in the banking sphere is a very important type of activity, which can cover a whole range of fraud schemes ? both from employees and customers. The article studies the existing technologies for realization of the system of security control over functioning of POS networks in real time and analyzes them in detail. Besides, the concept of a security monitoring system in POS networks is presented, its architecture is proposed, as well as a method for analyzing the flow of events and detecting fraud.