A Kind Of Encryption System Research Based On Composite Iterative And Sensitive To Plaintext Extremely

In recent years,with the development of the information industry,image encryption technology has been used widely,especially the image encryption system based on chaos have become one of the topic concerned.To design of the chaotic image encryption system,this paper discusses the TMS320DM642 as the core of hardware platform and the integrated development tool CCS as software platform.The chaotic image encryption system research and the construction of the hardware platform I have done in this paper as follows:First of all,consideration the large initial key space can against the force attack and the necessary of the key rely on the encryption image can resist differential attack,this paper proposes a chaotic encryption initial key research based on Lorenz equation.Basic train of thought is to produced a chaotic sequence by Lorenz chaos equation to deal with the image pixel values,which generated three initial value.The simulation results show that the key space of initial value has reached 1015,which can resist brute force effectively;at the same time,because of which rely on plaintext extremely,so it can resist differential attack effectively.Secondly,using the Lorenz and Rossler chaotic image encryption algorithm to process the image on the basis of the initial key: firstly,using the chaotic sequence which produced by Lorenz chaos equation scrambling the plaintext image and get a chaos scrambling image.Then put the number which produced by Lorenz chaotic sequence processing as the initial value of Rossler chaotic equation and generate a chaotic sequence,we can get an encrypted image when the scrambling image diffused by chaotic sequence.The experimental results show that: Making the correlation of compound chaotic system more closely when adopted a complex iterative algorithm,which result that a small error will cause a large of encryption errors;At the same time,the correlation of image between adjacent pixels achieve the minimum when through scrambling and diffusion process which can effectively resist attacks.Finally,the paper introduces the design based on chaotic image encryption system,selecting the TMS320DM642 chip of TI company as the core of hardware platform and integrated development tool CCS as the core of the software.The system is divided into six modules: DSP chip,storage module,image input and output module,LCD module,image pickup and power module.This paper describes the internal frame,hardware setting,workflow and the signal transmission path of the image sensing module and input/output module in detail.Improving the process of image encryption system in image data acquisition,transmission and output in detailAt the end of this paper,on the basis of the hardware platform we have done,encryption algorithm have been programmed through integrated development software,then burning the program to the hardware platform,making the system to perfect when finishing from image acquisition,image encryption processing to image output process.