Image Encryption Algorithms Based on Chaos Through Dual Scrambling of Dynamic Josephus Ring and Bit

Abstract

In this paper, in order to solve the problem that the scrambling method of most chaotic image encryption algorithms is not strong in non-linear structure and the correlation of adjacent pixels is not so destructive. A new image encryption algorithms was proposed based on chaos through dual scrambling of dynamic Josephus ring and bit. The algorithm uses logistic chaotic mapping as the key generation source, and makes the encryption process closely related to plaintext image information. Firstly, the algorithm establishes the advantage of dynamic Josephus ring disarrangement by contrast and then globally scramble the original image; Then the scramble sequence is expanded by 8 times, and the bits are scrambled by logistic chaotic sequence, and changed the degree of association of adjacent pixels from a single pixel; finally, the pixel value of a single pixel is replaced diffused to generate a ciphertext image. The experimental results show that this algorithm cannot only resist the choice of Ming (Dense) attacks, but also achieve better resist the differential attacks and statistical analysis. It has the advantages of simple encryption algorithm, large key space, good encryption effect and good application prospect.