Transmultiplexing as a Method of Protecting Digital Data Against Unauthorized Reading, in IoT Systems in Particular

摘要

Transmultiplexing is a method which combines many independent digital signals into a single complex signal transmitted by a single communication channel. Properly designed, it provides perfect reconstruction of source signals from a complex signal. The data integrity is guaranteed by a set of synthesis and analysis filters banks with integer elements. Filters banks with only `zeros' and `ones' ensure data integrity with minimal computing power. This solution is advantageous for simple IoT systems with many sensors and 8-bit microcontrollers. The paper contains selected examples of filter banks fulfilling a perfect reconstruction for a 4-input and an 8-input transmitter with only `zeros' and `ones' elements. The experimental system with digital sensors (temperature) verify the method of transmultiplexing. The results of attempts to read the proper temperature value from a composite signal sample haves been provided.