An Efficient Image Encryption Algorithm Based on Hyperchaotic and Two Times of Scrambling Diffusion

An image encryption algorithm based on hyperchaotic system is proposed to satisfy the security of image information transmission, the encryption algorithm consists of two times of scrambling and diffusion. The relation between plaintext and key is constructed to generate plaintext related chaotic sequence. Two rounds of scrambling operation are performed to make the pixel positions of the image are sufficiently scrambled, and two-way diffusion is carried out after scrambling, in this way, the value of any one pixel can affect other pixel values as much as possible. The information entropy, histogram distribution, adjacent pixel correlation, plaintext sensitivity, key sensitivity and key space are analyzed. As show by simulation results, our algorithm has good encryption effect and high security.