Digital Image encryption Algorithm Based on 2D Hyper-chaotic System
Qiu Yan · Journal of Shaanxi Institute of Technology · 2007
The 2D Hyper-chaotic system was applied to the digital image encryption based on the thought of the higher secrecy of a 2D hyper-chaotic system.Firstly it carried out pretreatment to a real chaotic sequence pro- duced by the system.Secondly,the index matrix of pixel permutation was structured directly by this real chaotic sequence,and digital image encryption was realized in the space domain.Finally,digital image was secondly en- crypted.The results of analysis and simulation show that the pretreated real chaotic sequence has the stronger pseudo-random,the better auto-correlation and cross-correlation characteristic.Additionally,the bigger se- cret-key space of the 2D hyper-chaotic system,the stronger the algorithm can be against decryption attack.