Realization of Chaos-Based Private Multiprocessor Network Via USART of Embedded Devices

Abstract

Data exchange in any form needs security irrespective of the mode and medium being used. Due to the owing fact of high sensitivity, chaotic functions have been widely used in cryptography. Serial data communication using USART is being the cost-effective and efficient means for data transfer among the embedded devices. Secrecy of data shared between any two devices via USART in a multiprocessor network relies only on the honesty of other devices in rejecting the visible data that are not addressed to them. This chapter aims at providing a scheme to establish a secure private communication channel between two nodes in a wired network of embedded devices connected via their on-chip USART. A chaotic digital function implemented on AVR microcontroller produces a symmetric key, which encrypts the data and varies the baud rate of USART to act as a major synchronizing factor between the sending and receiving embedded devices. Optimal values of code size, execution time and throughput were obtained from the realisation of the proposed work on an embedded network with on-chip USART of AVR microcontrollers. Based on the features and analyses, the proposed work shows significant benefits over the similar implementations available in the literature.