The Study Of Optical Multiple-image Encryption Techniques

With the wide application of the Internet and various information transmission technologies,the security of information in communication and storage has become a research hotspot.Optical image encryption technology is a new type of image encryption technology,which has shown superiority in some fields,especially in recent years.Information encryption technology based on optical theory and methods has many unique advantages.Optical information processing technology has the high capability of parallel processing and the optical information processing system can be integrally interconnected with each other,enabling optical information to be processed at high speed in parallel for large amounts of data in the case of encryption.At the same time,optical-based information encryption technology has a wide range of degrees of freedom to choose from,such as the amplitude,phase,polarization,wavelength,distance and angular momentum of light,which can be used as encryption parameters.With the rapid development of the information society,the traditional optical single image encryption technologies have difficult to ensure the development of information society.Therefore,in-depth research and development of multiple-image encryption technology with high security and practical application is a research topic with broad development prospects.This paper investigates the current development of optical multiple-image encryption technology,due to the limited capacity,low encryption quality and security problem of traditional optical image encryption technology,we had proposed an optical multiple-image encryption method based on double random phase encryption structure,which breaks through the bottleneck of the limited capacity of traditional double random phase encryption.At the same time,a two-channel optical asymmetric double-image encryption method based on matrix PLU decomposition and Gyrator transform is proposed,which greatly improves the security of image encryption and provides a reference for new optical image encryption technology.The main work of this paper includes the following three aspects:1.The classical image encryption technology based on double random phase encryption structure is introduced,The security of encryption method is emphatically analyzed and the corresponding encryption method is simulated.2.Aiming to solve the bottleneck of the limited capacity of double random phase encryption method,a simple method of multiple-image encryption based on double random phase encryption structure with the help of QR code and random binary plaintext is proposed.The basic principle of this implementation is described,and the sensitivity of keys and the security of system against attacks are analyzed.3.Combining matrix PLU decomposition and Gyrator transform,a two-channel optical asymmetric double-image encryption method is proposed.The basic principle of encryption scheme is expounded,and the sensitivity of keys and the security of system are analyzed.