Color image encryption method based on three-dimensional Logistic mapping and generalized Cat mapping

Abstract

The invention provides a color image encryption method based on three-dimensional Logistic mapping and generalized Cat mapping, which comprises the following steps: reading an original color image toobtain two-dimensional pixel matrixes corresponding to R, G and B components, and straightening the two-dimensional pixel matrixes to obtain three pixel sequences; three groups of chaotic sequences are generated through three-dimensional Logistic mapping iteration, and subjecting the three groups of chaotic sequences and the three pixel sequences to XOR operation to realize diffusion processing; carrying out data reconstruction on the chaotic sequence obtained after diffusion processing and expanding the chaotic sequence into a three-dimensional cube; performing position scrambling processingon the three-dimensional cube through generalized Cat mapping; and converting the three-dimensional cube with the scrambled position into a cuboid which is a ciphertext image. According to the method,parameters and initial values of three-dimensional Logistic mapping and generalized Cat mapping and the plaintext image size are used as keys, the key space is increased. Encryption safety is improved, and the method has the advantages of being high in key sensitivity, high in anti-attack capability and the like.

Description

technical field [0001] The invention relates to the technical field of color image encryption, in particular to a color image encryption method based on three-dimensional Logistic mapping and generalized Cat mapping. Background technique [0002] With the rapid development of modern information technology, more and more information is transmitted through the Internet, and people can use the network to transmit a large amount of text, multimedia, digital images and other information. In particular, multimedia communication has gradually become an important means of information exchange for people, and digital images have been widely used in people's lives, so information security has become an important issue in information transmission. [0003] Chaotic maps have high sensitivity to initial conditions and pseudo-randomness, and can be used to encrypt images to meet the security requirements of image encryption. Generally, the initial value and control parameters of the chao...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems of the existing image encryption algorithm with small key space, low encryption efficiency and poor security, the present invention proposes a color image encryption method based on three-dimensional Logistic mapping and generalized Cat mapping, which can increase the key space and enhance Security and Reliability of Ciphertext Image

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