一种基于STM32的FSO双层加密的通信方案设计OA

This paper uses STM32 chip and laser emitter and photodiode to build a free space optical communications system(FSOCS),and the aim is to propose a reliable communication scheme to address the security risks of optical signal interception.This scheme adopts a double-layer encryption strategy,and combines encryption algorithm SM4 and OCDMA technology to encrypt and encode data,so as to achieve secure transmission of data and multi-user multiplexing of channels.The research method uses STM32 chip to encrypt and transmit data and uses time-division multiplexing technology to reduce the system's bit error rate.The constructed optical communication system achieves encrypted signal transmission.This dual-layer encryption scheme effectively mitigates the risks of optical signal eavesdropping and information leakage,and enhances system security.Time-division multiplexing technology significantly reduces the impact of atmospheric attenuation on communication system performance,and improves communication quality of system.The proposed dual-layer encryption scheme provides an effective solution for addressing the security and reliability issues of optical communication.