Abstract
This research proposes a new image encryption scheme based on Lorenz hyperchaotic system and Rivest–Shamir–Adleman (RSA) algorithm. Firstly, the initial values of the Lorenz hyperchaotic system are generated by RSA algorithm, and the key stream is produced iteratively. In order to change the position and gray value of the pixel, the image data are hidden by additive mode diffusion. Secondly, the diffusion image matrix is reshaped into a one-dimensional image matrix, which is confused without repetition to hide the image data again. Then, the finite field diffusion algorithm is executed to realize the third hiding of the image information. In order to diffuse the pixel information into the entire cipher image, the additive mode diffusion algorithm needs to be looped twice. Finally, the cipher image can be obtained. The experimental results prove that the image encryption scheme proposed in this research is effective and has strong antiattack and key sensitivity. Moreover, the security of this encryption scheme relies on the RSA algorithm, which has high security.
Highlights
With the rapid development and popularization of Internet technology, multimedia has become an important means of communication for people
As a multimedia resource, are widely used in information communication because they can carry a large amount of information and express the information content intuitively and vividly
People who are not authorized can obtain the images, and the unauthorized cryptanalysis is a great threat to the information communication of images [1, 2]
Summary
With the rapid development and popularization of Internet technology, multimedia has become an important means of communication for people. As early as 1998, Fridrich [11] proposed a symmetric encryption scheme based on a two-dimensional chaotic map In this scheme, permutation-diffusion architecture was suggested to encrypt image content, where the permutation operation is performed to alter the positions of Security and Communication Networks the image pixels, while the diffusion operation is performed to change gray values. In order to improve security needs of image content, the method [23] of encryption scheme combines the techniques of chaotic image encryption and DNA (deoxyribonucleic acid) sequence operations. The matrix semitensor product (STP) operation is applied to the chaotic sequences and the scrambled image to generate an encrypted image. In order to enhance the strength of the cryptosystem and provide higher security, a chaotic synchronization cryptosystem combined with RSA encryption algorithm was proposed in [40]. The cipher image is reencrypted by using chaotic synchronization
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