A Novel Image Encryption Algorithm Based on Two-dimensional Generalized Logostic Mapping
Lei Tu · Control Engineering of China · 2014
This paper proposes a 2-dimensional generalized logistic chaotic mapping,by using the analysis method of phase maps,Feigenbaum constant,bifurcation graphics,we studied its complex nonlinear dynamic activities.And a chaotic sequence is generated from it,then the chaotic sequence is optimized into secret key stream,and output-feedback technology is used in the encryption algorithm.The results of experiment show that the encrypted image has random-like distribution behavior of grey values,the extremely sensitive to the key that enhances the ability of resisting the chosen plaintext attack,the information entropy of the cipher image is 7.996 94,it is very close to the ideal value 8,the correlation between the encrypted image and the plain image is close to 0,the adjacent pixels have zero co-correlation properties,the key space reachs 299 bits,the encryption method has changed the pixel value of the original image greatly,it makes the ciphertext can resist statistical attack.