Information technology of user authentication in cross-platform systems

In conditions of information technology growth, systems which are being developed to be used on multiple platforms, gain in importance and popularity. As a rule, such systems have client-server architecture and have strong security requirements for user authentication. In this paper the information technology of user authentication for cross-platform systems has been developed, which is characterized by high reliability and efficiency. Additional researches on the appearance of collisions while generating unique keys for user authentication have been carried out. These investigations allowed for recommendation the appropriate identifier length for a real project.