Research On Encryption Scheme Of Computational Ghost Imaging Based On Hyperchaotic And Compressed Sensing

Computational ghost imaging technology,as an emerging optical technology,has good spatial resolution and resistance to environmental interference.Once it appeared,it attracted the attention of researchers and was widely used in military,encryption,radar and other fields.With the development of information security technology,the information security problem of computational ghost imaging has also attracted people's attention.How to ensure that the image information transmission process is not stolen and tampered,and achieving a secure encrypted channel is an important research topic of computational ghost imaging.Therefore,it is of great practical significance to study the safety of computational ghost imaging technology.This article first outlines the background and significance of the subject research,mainly introduces the development history of ghost imaging and the current research status of encryption schemes based on computational ghost imaging technology at home and abroad,and introduces the development history of chaotic systems and the current research status of chaotic encryption.Then,the basic theory of ghost imaging,the process of encryption based on computational ghost imaging technology,compressed sensing theory and chaos theory are discussed in detail.Finally,two encryption schemes based on computational ghost imaging technology are proposed.The specific contents are as follows.(1)This paper proposes a computational ghost imaging encryption scheme based on hyperchaotic system and DNA encoding.In this scheme,four long pseudo-random sequences are generated by a four-dimensional hyperchaotic system,and then the phase mask sequence is obtained by diffusing these pseudo-random sequences through DNA operations.Finally,multiple random phase mask matrices are generated from the phase mask sequence and loaded into the spatial light modulator(SLM).The laser beam is transmitted through the spatial light modulator,and the spatial light modulator performs phase modulation on the laser beam to generate incoherent light.After Fresnel diffraction,the modulated beam is transmitted to the object plane,and the intensity of the light field transmitted through the object(or reflected back)is received by the barrel detector behind the object plane.The detection result of the barrel detector is the ciphertext.Simulation results and safety analysis prove that the scheme has good performance.(2)This paper proposes a compressed sensing ghost imaging encryption scheme based on KSVD algorithm.In this scheme,first,a four-dimensional hyperchaotic system is used to generate a pseudo-random sequence,and the sequence is transformed by DNA coding technology to generate a phase mask matrix to achieve phase modulation of the laser beam.Secondly,the KSVD algorithm is used to sparsely represent the original image,and the sparse image is placed on the object plane as the image to be encrypted.Then,the modulated beam illuminates the object plane and is received by the barrel detector behind the object plane,and the detection result of the barrel detector is the ciphertext.Finally,the compressed image reconstruction technique is used to recover the original image from the ciphertext.Simulation verification and security analysis show that the proposed encryption scheme can effectively resist known attack methods,and on the premise of ensuring the quality of decrypted images,greatly reduce the number of samples and improve the image transmission efficiency.