Study on Image Encryption Algorithm Based on Faster Permutation Coupled with 3D Chaotic Map
Ling Wu · Video Engineering · 2014
To these lacks of image encryption of current 3D chaotic map such as low security,the large amount of calculation during permutation,and not universal resulting in low computation efficiency,the fast scrambling method is designed,and the mixing and diffusion mechanismare simultaneously introduced into this algorithm to propose the image encryption algorithm based on the fast scrambling integration with 3D chaotic map to strengthen the security of the algorithm for well overcoming above defects. Firstly,the fast scrambling method is used to permute the initial image to change the position of pixel,the initial external key is obtained by 3D Chen system with transform function of pixel value to confuse the pixel of the permutation image under the mixing mechanism; changing the initial external key,the 3D chaotic map is iterated again to get a three triple 1D pseudo-random array,and the key stream mechanism is used to quantity the array to get one new array,using the new array to diffusion the confused pixel. The MATLAB simulation software is used to compare the encryption algorithm proposed by this paper and other 3D image algorithm,the results show that,compared with other 3D algorithm,the security of this image encryption algorithm is higher,the permutation speed is faster,and the computation efficiency is higher,as well as the key space is huge.