Research On Application Of Wireless Secure Communication Based On STM32

With the progress of science and technology,the application field of embedded system is becoming more and more popular,and the wireless communication equipments with STM32 as the main controller are also more and more.Wireless communication has gradually replaced wired communication in many fields,and has become one of the most rapidly developed and promising fields.However,due to the open nature of wireless networks,information hidden dangers are buried in the security of wireless communications.With the increasing attention to personal privacy,the confidentiality of information in the transmission process has become a hot research topic.How to ensure the security of information in the wireless transmission path has become an urgent problem to be solved.At present,classical cryptography has been widely studied,and many methods of recovering plaintext from decrypted text have been published.People are trying to find a new secure communication mechanism to better solve the problem of communication security.Some dynamic characteristics of chaotic systems correspond to some security features of traditional cryptosystems,while the good mixing of traditional cryptosystems implies chaos.Aiming at the above problems,this paper applies chaos synchronization control theory to encrypt and decrypt information in embedded wireless communication system.The specific research work of this paper is as follows:1.By introducing the achievements of the development of chaos and chaos synchronization in various stages,this paper comprehensively discusses the recent research status of chaos and chaos synchronization at home and abroad.At the same time,the definition,basic characteristics and common discriminant methods of chaos are given.The basic concepts,common types and characteristics of chaos synchronization are described in detail.2.Summarize the current situation of Wireless Secure Communication at home and abroad,and elaborate the relevant chaos theory involved in this topic.Taking two chaotic systems with model uncertainties,parameter uncertainties and external disturbances as research objects,a new terminal sliding mode surface is proposed,and a new finite-time sliding mode control law is designed to synchronize the system.Taking the unified chaotic system with parameter switching as the research object,the perturbation term is constructed innovatively by the state variables of Chen system,and a simplified adaptive controller is designed to realize fast synchronization between the response system and the chaotic driving system with parameter switching.3.In image secure communication based on chaotic synchronization,the image information is encrypted and decrypted by the combination of pixel position replacement and pixel substitution.The security of encrypted image is analyzed from three aspects: gray histogram,correlation of adjacent pixels,sensitivity of key and size of space.4.Designed the hardware wireless transmission system based on STM32,designed the functions of the transmitter and receiver of the system,and applied chaotic encryption in image transmission by software,which improved the confidentiality and anti-decoding ability of communication.