An IoT-Oriented Secure Audio Communication Framework Using LSB Steganography, RSA, and MQTT

Abstract

The effectiveness of the data hiding techniques has been the subject of a large amount of research. One of the most secure ways of transmitting data in the digital era is the use of audio steganography whereby a secret message is hidden in an audio file without any modification of the audio file. In this paper, I am going to propose a steganography technique that has a high carrying capacity with the Least Significant Bit (LSB) substitution technique. Also, the RSA cryptosystem is secured on the inability to solve the factoring problem easily. The private and the public keys are mathematically connected to each other that the extraction of the private key out of the public key can only be impossible or computationally infeasible. This design guarantees the security and strength in two levels. There is high similarity between the original signal and the stego-audio signal that reduce the possibility of finding the stego secret message in the stego-audio signal. The proposed algorithm is implemented using MATLAB and the results are given. The parameters of the system are assessed based on a transparent gateway TCP network, and mathematical model of retransmission-based mutant Quality of Service (QoS-0) is created. Probability model is tested on a real physical network and experimented with repeatability of content delivery using VM based MQTT, a local network server, and remote server. The findings show that retransmission of the content by the sender leads to improvement of the probability of content delivery most particularly in the unreliable MQTT-based Internet of Things (IoT) environment, which is part of the development of smart city applications.