Research On Image Encryption Based On 4D Hyperchaos Theory

In recent years,with the development of Internet and multimedia communication technology,there are various security risks.As information spreads freely on the network and digital images are widely used on sharing platforms,there are more and more hidden dangers of information security,such as illegal theft,tampering and dissemination of information.As an important carrier of information,image also has many risks in the process of transmission.Therefore,image encryption method with strong anti-attack ability has always been the core research direction in the field of information security.In this paper,a compressed sensing method based on 4D hyperchaos system and an image encryption method based on double random phase coding are proposed as well as a compressed sensing method based on 4D hyperchaos system and an image encryption method based on computational hologram.The main contents include:A novel image encryption algorithm based on 4D hyperchaotic system compression sensing and double random phase coding is proposed.The DRPE was implemented using Logistic Chaos mapping and the 4D NHS Hyperchaos system as a double key to get the final encrypted picture.This method takes full advantage of the combination of CS and DRPE,which not only reduces the storage space and transmission bandwidth,but also improves the security performance of encryption.Simulation experiments and comparative analysis show that the proposed image encryption scheme has good security,robustness and decryption quality.A new image encryption algorithm combining Logistic mapping,4D hyperchaos system,compressed sensing and Fourier transform based computational hologram is proposed.The sparse coefficient matrix of plane image is firstly confused by zigzag scanning.The second obfuscation is performed by index sort.Finally,CGH encryption is carried out.Logistic chaotic mapping and four-dimensional NHS Hyperchaotic system are used as double keys to realize CGH based on Fourier transform to get the final encrypted picture.The scheme makes full use of the advantages of the combination of CS and CGH to realize compression and encryption at the same time.Through phase truncation,the amount of data and the storage and transmission of encrypted data are reduced.Finally,the encrypted image is a real function.Simulation experiments and comparative analysis show that the encryption system has high security,robustness and decryption quality.