Image Encryption Scheme Based On Three-dimensional Logistic Chaotic Sequence

In recent years,with the rapid development of modern information network technology and various new multimedia processing technologies,images have become one of the increasingly important information media in people's work and life.However,with the popularization and openness of the network,the security of image information is becoming a problem.The security of image information is not only directly related to the privacy of individuals,but also directly related to the business secrets of enterprises,especially for the sensitive occasions such as government,military,diplomacy,e-government,etc.,even directly related to national security and national interests.Faced with the security problems of various kinds of multimedia information in real life,multimedia image information has many characteristics such as large amount of data,high redundancy of data,special coding structure,etc.,Therefore,the traditional data encryption algorithm can not be directly used in digital image data encryption,it is difficult to meet the real-time requirements,and the data format will be changed during the decryption process,it is necessary to adopt a special encryption algorithm for digital image.Chaotic systems are highly sensitive to initial conditions,unpredictable and random,and are very suitable for image encryption,the image encryption technology based on chaos has gradually become a hotspot in the field of multimedia image information encryption.At present,most of multimedia image encryption schemes based on chaos theory adopt low-dimensional chaotic map.In this paper,a lightweight image data encryption scheme based on Tent chaotic map is designed,which has the advantages of simple algorithm and fast encryption speed,it can be used in applications where the image security requirement is not high,but the computation cost and the response time are high.With the development of research and various attack techniques,low-dimensional chaotic systems can not satisfy the high security applications of image encryption because of the small key space and poor anti-exhaustive ability.Therefore,an image encryption scheme based on improved Zigzag transform and three-dimensional Logistic chaotic map is proposed in this paper,which makes full use of the characteristics of chaotic map and greatly improves the encryption speed.The scheme extends the one-dimensional chaotic map to three dimensions,sets three parameters and three initial values,greatly improves the key space,enhances the defense ability against exhaustive attack,and effectively meets the technical requirements of image encryption,it has better security and application value.