Simulation Research on Novel Image Encryption Merging Algorithm
M Zhang · Jisuanji fangzhen · 2014
Recently,low-dimensional chaotic system is regarded as a popular technique in image encryption research filed.However,this system can not defense attacks effectively due to the weaknesses such as small key space as well as low-level security.In this paper,we proposed a novel image encryption algorithm based on hyper-chaotic Chen system merged with CAT map,which takes key stream related with plain image into consideration so that connection is made during key stream,initial image and key.First,the position of each pixel in image was changed by discrete CAT map.Then,the hyper-chaotic system was used to change the pixel value.Next,a plain image was encrypted by key from key stream.We realized the algorithm with Matlab.The experiments demonstrate that our method has high performance in encryption,and is able to improve key space significandy and the ability of anti-plaintext attack.