Research On Optical Image Encryption Based On Interference

With the rapid development of communication technology,the demand for information security in the process of information transmission is becoming higher and higher.Digital image encryption technology based on optical principle is widely used in the process of modern digital image transmission because of its advantages of multiple encryption keys,parallel processing and so on.The image encryption technology based on optical interference principle is simple and easy to implement.Therefore,it becomes one of the most frequently used methods in optical image encryption.But the image interference principle of encryption technology with the silhouette of the hidden danger based on that does not use all the correct encryption phase plate,can see a part of the original contour information before encryption of digital image in image decryption,the security encryption system cannot be guaranteed effectively.This paper will focus on the security of optical interference image encryption technology,and discuss how to solve the problem of contour display,and further enhance the security of encryption system.Firstly,the research background and significance of this subject are introduced,and the development history of optical image encryption is briefly described.Secondly,introduces the different optical encryption algorithm,first introduced the optical encryption based on Fresnel diffraction of traditional methods,then put forward the improved fractional Fourier transform and Fourier transform of multi parameters to increase the number of keys,to enhance its security.The analysis of silhouette,we put forward two kinds of methods to reduce the silhouette appeared,the first method only requires the use of a phase plate and a plate of amplitude;the second method,is mainly to increase the number of phase plate,to keep the improved algorithm simple at the same time,we should try to control the number of phase plate the use of.By using these two methods,the appearance of the contour will be mitigated or completely eliminated after decryption.Finally,we present an optical encryption system based on the mode decomposition algorithm,this kind of optical encryption technology can completely eliminate the silhouette phenomenon,enhanced optical encryption security and robustness and further on this basis.The computer simulation results verify the system security of the above methods,the image restoration of the original image and contrast,this paper proves several optical image encryption algorithm and its improved method is feasible,in the future,further research the significance of several methods.