A Chaotic Block Cipher of Substitute-permutation Structure for BMP Image
Wang Wei, Fenlin Liu, Xu Han · International Conference on Multimedia Information Networking and Security · 2013
In this paper, a chaotic block cipher of substitute-permutation structure is proposed based on the data feature of BMP format image and the design idea of a color image encryption algorithm. In the encryption algorithm, the plain image is first divided into blocks of size 2fi2 , and the four elements in all block can be regarded as four different sequences. Then every sequence is encrypted by a secrete sequence generated by a four dimension chaotic system. In the cipher image, the distribution of pixel value and position are mixed up drastically, arrive the purpose of confuse and diffusion. Finally, analysis and experimental results show the security of the algorithm.