Research On Image Encryption Algorithm Based On Chaotic Map And Bits

Objective With the rapid development of the Internet,the transmission of image information on the network has become more and more widespread.And digital images have the characteristics of intuitiveness of visual expression and large amount of data carried.Traditional encryption methods are difficult to meet the requirements of encryption.Therefore,research on digital image encryption algorithms based on chaotic mapping and Bit has become a hot spot.Methods In order to break the strong correlation among the three channels of color image R,G,and B,a color image encryption algorithm based on five-dimensional chaos and Bit perturbation is proposed.This algorithm constructs a new five-dimensional chaotic system.The chaotic system can generate multiple scroll chaotic attractors in multiple directions,and the number of scroll chaotic attractors can increase with the evolution of time.At the same time,these five chaotic sequences are used for color image encryption.In the encryption process,in order to break the strong correlation between the three channels,the R,G,and B channels of the plaintext image are combined into a matrix.Aiming at more complicated dynamic characteristics and diffusion methods,a new digital image encryption method based on a new five-dimensional multi-loop multi-wing hyperchaotic system is proposed.First,the plaintext matrix and five chaotic sequences are decomposed into an orthogonal matrix and an upper triangular matrix by orthogonal decomposition of a rectangular matrix,respectively.The five chaotic sequences generated by the chaotic system are respectively decomposed into an upper triangular matrix and a lower triangular matrix by the LU decomposition method,and two upper triangular matrices and a lower triangular matrix are added respectively to obtain five discrete chaotic sequences.Secondly,the orthogonal matrix decomposed by the plaintext image matrix is multiplied by five orthogonal matrices decomposed by five chaotic sequences.At the same time,the elements in the upper triangular matrixdecomposed by the plaintext image matrix are chaotically arranged by the chaotic sequence,and then the two matrices after the operation are multiplied.Finally,the multiplied matrix is chaotically placed on the bit by a chaotic sequence.Then use the chaotic sequence to perform a bitwise XOR operation to obtain the final encrypted image.Results Through theoretical and numerical simulation experiments,the above two encryption algorithms have good encryption effects.Conclusion The two proposed encryption algorithms have a good application prospect in the secure communication of digital images.