SYSTEM FOR SECURE INFORMATION EXCHANGE OF TEXT DATA THROUGH THE RADIO CHANNEL IN THE ISM BAND

Abstract

A system of secure information exchange of text data through the radio channel of the ISM band is developed. The system uses non-separable factorial coding and allows the transmission and reception of text messages and arbitrary binary data. Messages are divided into groups of two symbols, from which a permutation is formed by bijectively transforming the binary sequence into a factorial number system. On the receiving side, the permutation is checked for belonging to the allowed set of permutations and reverse conversion is made, after which the text message is issued to the user in the form in which it has been sent. The purpose of the work is to create a system of secure information exchange of text data through the radio channel of the ISM band based on factorial code with data recovery by permutation and to create software and prototypes that implement this system. The scientific novelty of the work consists in the formation of models of the interaction of system components of secure information exchange based on factorial code with data recovery by permutation, which allows the building of structural schemes, algorithms, and protocols for data processing and transformation. The practical value of the work is determined by the developed and implemented algorithms for secure information exchange of text data, which includes the transformation of text information into a number in the factorial coding system with further transformation into permutation on the transmitting side and reverse operations of decoding the message on the receiving side. On the basis of the developed algorithms, a structural diagram of the transceiver device, program code, and prototypes of the system of secure information exchange of text data have been created. The developed system can establish secure communication between terminals by using basic permutation as a key.