Design of Embedded Audio Encryption Communication Equipment Based on Bluetooth

Abstract

For the security problem that the content of audio call is easy to be eavesdropped, this paper introduces an audio encryption communication device for mobile communication terminal. The system is mainly composed of two core processors CSR8670 and STM32F103 and its peripheral hardware circuits. The CSR8670 implements a link connection between a mobile phone and a device for transmitting audio data. The STM32F103C8T6 is used to implement intelligent control and data processing functions for the system. The audio encryption module adopts a low-power audio encryption dedicated chip MX128, and realizes the function of audio encryption and decryption by designing a hardware circuit. Through many experimental tests, the device can realize audio encryption communication between different mobile phones and different mobile networks.