Aiming at the problem of insufficient encryption of a single chaotic system
the main proposed algorithm is an image encryption algorithm based on improved LCL composite chaotic system and DFT variation. Firstly
DFT transformation of images is carried out
chaotic sequences generated by high-dimensional Lorenz system are randomly combined and arranged
and a group of obtained index sequences are combined with an improved Cat system to scramble plaintext images; Secondly
the pseudo-random sequence of Logistic map is designed by using hyper-Lorenz chaotic system
and the encrypted image is obtained by XOR processing. In order to achieve better encryption effect
repeat the above steps for cyclic encryption. The simulation results show that the algorithm designed in this paper has excellent encryption effect
large key space
strong sensitivity to plaintext
and can effectively resist statistical attacks.
关键词
Keywords
references
ZHANG W, WONG K W, YU H, et al. An image encryption scheme using reverse 2-dimensional chaotic map and dependent diffusion [J]. Communications in Nonlinear Science and Numerical Simulation, 2013, 18(8):2066-2080. DOI: 2066
WANG J, CHEN G.Design of a Chaos-Based Digital Image Encryption Algorithm in Time Domain[C]//IEEE International Conference on Computational Intelligence%Communication Technology. IEEE, 2015: 26-29.