Chaotic Encryption Method Research On Color Video And FPGA Implementation Of Secure Communication System

As the pivotal basic components in many machinery equipments,there are countless catastrophic consequences due to the faults of rolling bearings.Rolling bearing life tester has good engineering value for it can well simulate the rolling bearing running state under complex condition.But most life tester need the staff monitor on-site for a long time to prevent an accident in their running process,and the environment is noisy,so it not only wastes the manpower,but also produces some negative effects to the body.The measurement and control system of tester also does not have data sharing function,the technical personnel need to copy data to the scene if he wants to analyze the collected data,so that it not only wastes time,but also increases the management difficulty of the laboratory.As a product of multimedia technology development,video images are widely used in security surveillance,medical diagnosis and instant messaging,and the video image security issues have attracted more attention.The traditional encryption algorithm can not meet the requirements of modern encryption.The similarity between chaos theory and cryptography and the excellent performance of chaotic system satisfy the encryption requirements of video images.Therefore,the research and implementation of encryption algorithms based on chaotic system has broad application prospects.In this thesis,the chaotic encryption method research on color video and FPGA implementation of secure communication system are regarded as the main line.The design and implementation of high-dimensional hyperchaotic system,the design of video image chaotic encryption algorithm,and the design and implementation of video chaotic secure communication system are respectively studied.For the design and simulation of high-dimensional hyperchaotic systems,high-dimensional continuous-time hyperchaotic system and high-dimensional discrete hyperchaotic system are designed respectively,and software simulation and characteristic analysis are carried out to verify the complex dynamic behavior of hyperchaotic system.And the designed high-dimensional discrete chaotic system is implemented on the FPGA.In the design aspect of chaotic encryption algorithm on video and image,a video encryption algorithm based on high-dimensional discrete hyperchaotic system is designed.The ciphertext feedback mechanism is used to increase the unpredictability of chaotic system.The experimental results show that the effect of the encryption algorithm is good and the security of that is high.The existing chaotic encryption scheme of the image only depends on the excellent characteristics of the chaotic system and the discrete process algorithm of the high-dimensional continuous-time chaotic is complex,so that the security of the encrypted image is low and the time of acquiring the discrete sequence is time-consuming,then a multi-channel color image chaotic encryption algorithm is proposed based on DNA coding.The experimental results show that the proposed encryption algorithm has good encryption effect compared with other methods,and it can resist various types of attacks and has high security.At the same time,the chaotic sequence generated by the discrete chaotic system does not need to pass the discrete algorithm,which is short in time,so that which can improve the execution efficiency of the algorithm.In the design and implementation of video chaotic secure communication system,FPGA is used as the hardware core of the whole system to complete video acquisition,preprocessing,encryption,transmission,decryption and display.The system is divided into encryption end and decryption end.The drive-response method is used to synchronize the chaotic system and can meet the real-time and security of video data encryption.