Three dimensional image encryption algorithm based on quantum random walk and multidimensional chaos

Abstract

With the development of computer network technology, people's demand for information security is increasing. However, the classical encryption technology has the defects of small key space and easy to be cracked. The problems of image encryption technology in protecting image information security and private content need to be solved urgently. As a new type of quantum key generator, quantum random walk has a large key space. Compared with the classical random walk, the computing speed and security are significantly improved. This paper presents a three-dimensional image encryption algorithm based on quantum random walk and involving Lorenz and Rossler multidimensional chaos. Firstly, Gaussian pyramid is used to segment the image; Secondly, the Hamming distance of several sub images is calculated by using the random sequence generated by quantum random walk and the random sequence generated by Lorenz chaotic system in multi-dimensional chaos, and then synthesized, and the Euclidean distance between the three RGB channels of the image is calculated; Finally, the sequence value obtained from the remainder of Hamming distance and Euclidean distance is input as the initial value into the Rossler system in multi-dimensional chaos to generate a random sequence as the key to XOR the RGB channel of the image to obtain the encrypted image. The corresponding decryption scheme is the inverse process of encryption process. In addition, in terms of transmission security, this paper uses the blind watermark embedding algorithm based on DCT and SVD to embed the watermark information into the encrypted image, so that the receiver can extract the watermark and judge whether the image is damaged by attack in the process of transmission according to the integrity of the watermark information. If it is not attacked maliciously, decrypt the image. This operation further improves the protection of image information security.The experimental results show that the peak signal-to-noise ratio of the encrypted image is stable between 7-9 and the encryption effect is good, the GVD score is close to 1, the correlation of the encrypted image is uniformly distributed, and the correlation coefficient is close to 0, and the key space 2<sup>128</sup> and the encrypted histogram is evenly distributed, and has a high ability to resist statistical analysis attacks.