Design of image confusion-diffusion cryptosystem based on vector quantization and cross chaotic map

With the rapid growth of image transmission over the public networks, image compression and encryption has received increasing attention to reduce the redundancy and ensure security. In this paper, a scheme of image compression and encryption based on vector quantization (VQ) and cross chaotic map has been proposed that simultaneously compresses and encrypts the image based on confusion-diffusion cryptosystem. Extensive security analysis has been performed on the proposed scheme by using key space analysis, key sensitivity analysis, statistical analysis and differential analysis. Results of our analysis show that the proposed scheme has high security, significant savings in computation and good compression performance.