Research On Image Encryption Based On Chen Chaos

With the rapid development of network technology,more and more multimedia information with image and video transmitted on the network,affecting our daily lives,making communication more convenient,but it also brings some problems about security.How to use encryption technology to ensure the security of image information has become more and more attention to researchers.Chaos is very suitable for image encryption because of its complexity,sensitivity to initial values and unpredictability.Chaotic image encryption has become an important research direction in image encryption.Compared with the low-dimensional chaos,the high-dimensional chaotic system is more suitable for image encryption and has a wider research space because of the advantages of more system initial value,more complex dynamic behavior and larger key space.In this paper,the research of Chen hyperchaotic image encryption is carried out.Firstly,the background and current situation of chaotic image encryption are expounded,and the knowledge of chaos theory and the research of image encryption are introduced.Secondly,this paper presents an image encryption algorithm based on three-dimensional Chen chaos and an improved algorithm.The algorithm uses the chaotic sequence to scramble the pixel location,and then uses the chaotic sequence to scramble the image pixel value to change the value and finally obtains the encrypted image.The experimental results show that the algorithm has large key space,and the ciphertext image is distributed evenly,but it is not sensitive to the plaintext.On the basis of the original algorithm,the chaotic initial value acquisition and encryption operation are improved.The experimental results show that the improved algorithm makes the ciphertext sensitive to the plaintext.Compared with the original algorithm,the ciphertext image is more random and the correlation of the adjacent pixels is smaller.Finally,a further study of Chen chaotic image encryption is proposed.An image encryption algorithm based on Chen hyperchaotic and bit plane scrambling is proposed.The image encryption algorithm is based on hyperchaotic sequences and bit-plane decomposition.Firstly,this algorithm decompose the image into a binary plane;secondly,The Arnold scrambling is used to scramble the pixel positions of the upper 4-bit plane;and thirdly,the Chen hyperchaotic sequences generated by the initial iterations associated with the plaintext are used to scramble the pixel values for each plane;Finally,the scrambled planes are integrated into ciphertext images.Experimental results and data analysis show that the gray image of the encrypted image is evenly distributed,the key space is large and highly sensitive,and it can effectively resist statistical and differential attacks,but it can not effectively resist the noise attack.The algorithm needs to be further studied and improved.