Multiple-Image Encryption And Compressive Sensing Reconstruction In Phase Space

With the rapid development of information technology,people’s dependence on the information network is increasing,and information security is the precondition of the network that can work regularly.Information security technology has become one of the key technologies to protect the personal and collective information from infringement.More and more communication and store requires protection,so information security technology is facing many new challenges,such as security requirements and amount of information are increasing.Nowadays,information security technology has attracted wide attention.At present,the research of information security technology mainly includes the traditional information security technology based on mathematical principle and new information security technology,such as optical information security technology,biometrics recognition,quantum cryptography and so on.Compared with the traditional information security technology,optical information security technology has advantages of high parallel speed,high processing speed,and high encryption dimension,etc..However,most of the optical information encryption systems are linear,and the linear relationship between the plaintext and ciphertext lets systems have a big security hidden danger.Firstly,this paper analyzes encryption and decryption schemes of some typical optical information encryption systems based on the theory of optical information security,and the computer simulations are carried out.This indicates the security hidden danger of classical optical encryption systems.Then,the encryption principle and decryption algorithm of optical encryption technology in phase space are introduced and its security is analyzed in this paper.The relationship between the error and sampling rate is derived and simulated.After that,this paper proposes a Compressive Sensing reconstruction algorithm which could accurately reconstruct the original plaintext only using partial ciphertext to overcome the shortcoming of the huge amount of information in phase space encryption,and analyzes the relationship between the reconstruction error and sampling rate,and also the success rate and sampling rate.Finally,A multiple-image encryption scheme in phase space based on distance modulation and Compressive Sensing reconstruction is proposed to break through the limitation of channel width,and analyzed the relationship between the error and the quantity of information to be encrypted.