Обеспечение селективного доступа при широковещательной передаче информации

Abstract

Introduction: One of the main conditions for effective functioning of any information transfer system is its information security. An objective property of information system security is its gradual decrease at an invariable structure of the protection means, or when their parameters are fixed. To maintain the information security and prevent unauthorized access, the outdated keys in the cryptosystem are periodically replaced. In broadcasting systems of information transfer with selective access, there are features of ensuring information security related to the lack of a return channel of information transfer. Therefore we need to develop special methods of cryptographic protection for broadcasting information systems. Purpose: The goal is to improve the existing cryptographic system of data protection in order to increase the security of information transfer broadcasting channels with selective access. Results: A modification of data protection methods is proposed which should prevent unauthorized access to the system under conflict conditions of interaction with the violator. The modification is based on asymmetrical cryptographic systems with the mathematics of elliptic curves. On the base of the proposed methods, a cryptographic system is built to protect the data transferred via the channels of a broadcasting information system with selective access. An example of generating a common session key is given for the closed operation mode. Practical relevance: The proposed ways of improving the information transfer protection from unauthorized access can increase the information security of the system on the basis of using combined cryptosystems and mathematics of elliptic curves.