Encryption speed improvement on “an improvement over an image encryption method based on total shuffling”
Yong Zhang · 2013
Encryption security and encryption speed are two important aspects of image encryption algorithm. Recently, Zhang et al. proposed a plaintext related image encryption method based on chaos and permutation-diffusion architecture [G. Zhang, Q. Liu, Opt. Commun. 284 (2011) 2775-2780]. In the same year Wang et al. pointed out that Zhang's scheme cannot resist chosen plaintext attacks [X. Wang, G. He, Opt. Commun. 284 (2011) 5804-5807]. Most recently, Eslami et al suggested an improvement over Zhang's method with slower encryption speed [Z. Eslami, A. Bakhshandeh, Opt. Commun. 286 (2013) 51-55]. This paper presented another improvement over Eslami's scheme using a lookup table to enhance the speed of encryption algorithm without loss of security, which makes it more feasible in practical communication.