Adaptive Block Image Encryption Algorithms Based on Generalized Feistel Structure
WU Cheng-mao · Journal of Ankang University · 2013
In order to improve the security of the image encryption algorithms,the generalized quasi-feistel structure block cipher algorithm for image encryption is proposed.Firstly,the triangular chaotic sequence generated by triangular chaotic map and plaintext is segmented into four equal sub-blocks.Secondly,the triangle chaotic map combined with gray-scale diffusion mechanism is used to replace the gray values of plaintext.Lastly,the improved encryption algorithm based on quasi-feistel structure and triangle chaotic sequence is applied to realize the encryption of the replaced plaintext.Analyzing the encrypted image by means of gray level co-occurrence matrix(GLCM),it shows that the neighborhood pixels of encrypted image has good performance of space random uniform distribution.