An image encryption method based on multidimensional chaotic system and Joseph scrambling

Abstract

The invention provides an image encryption method based on a multi-dimensional chaotic system and Josephf scrambling, and the method comprises the steps: carrying out the initialization of PWLCM mapping and 2D-LSCM mapping, and obtaining a sequence X, a sequence Y and a sequence Z; uniformly dividing the original image into sub-matrixes according to indexes, carrying out Gray curve scrambling on pixels in the sub-matrixes, and carrying out sequential recombination to obtain a recombined image matrix; taking out elements in the sequence X as a crossover operator, and performing bit crossover operation on the recombined image matrix to obtain an image matrix; taking out a pseudo-random value in the sequence Y as the step value of fixed-step Josephh scrambling, and performing Josephh scrambling operation on the image matrix to obtain a matrix; and taking out the pseudo-random value in the sequence Z and the element pixel value in the matrix to carry out XOR ciphertext feedback to obtain afinal encrypted image. The method can effectively encrypt the image, has a large key space, has high sensitivity to the to-be-encrypted image and the initial key, and has good defense capability whenresisting various attack modes.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to an image encryption method based on a multi-dimensional chaotic system and Joseph scrambling. Background technique [0002] In today's era, with the unprecedented rapid development of science and technology, information and data security is playing an increasingly important role. How to protect information security has become an important topic that many scholars cannot ignore. In order to ensure the integrity and security of information, many encryption algorithms and common standards are used to protect network information security, such as DES, AES, etc., and are applied to data encryption of text structure. Shannon laid a solid foundation for cryptography and encryption algorithm system and put forward the famous encryption system theory. Many encryption algorithms based on chaotic systems emerge as the times require. Mishra proposed a text encryption algorithm us...

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Problems solved by technology

[0005] Aiming at the technical problems of complex management and slow operation speed of the traditional image encryption method, the present invention proposes an image encryption method based on multidimensional chaotic system and Joseph scrambling, based on the pseudo-random sequence generated by multidimensional chaotic system, namely PWLCM mapping and 2D-LSCM mapping , combined with Gray curve scrambling, Joseph scrambling and other encryption methods, realizes effective encryption and protection of image files, and has fast calculation speed, strong security and good defense performance

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