Image encryption method based on sine mapping and Logistic chaos sequence

Abstract

The invention relates to an image encryption method based on sine mapping and a Logistic chaos sequence. The image encryption method is technically characterized by including the steps of recording gray values of all pixel points of an original image as a two-dimensional matrix Q(x,y), obtaining a numerical value c by conducting the bitwise XOR on the gray value of each pixel point of the image, obtaining the chaos sequence through sine mapping, conducting scrambling c times on the original image in a certain mode, obtaining a scrambled image pixel matrix Q1(x,y), conducting bitwise XOR calculation bit by bit through the chaos sequence produced by a Logistic chaos system and the matrix Q1(x,y), and completing the encryption process. Due to the fact that the image is encrypted through two types of chaos mapping, the image encryption method has the advantages of being high in imperceptibility, high in secret key sensitivity, good in safety, strong in anti-attack capacity, particularly high in anti-plaintext-attack capacity, and suitable for being used for image secret communication.

Description

technical field [0001] The invention relates to a new image encryption method based on sinusoidal mapping and Logistic chaotic sequence, which belongs to the field of information security, in particular to the field of image encryption, and mainly utilizes two kinds of chaotic sequences to encrypt images. Background technique [0002] With the continuous development of multimedia technology, digital images have overcome the problems of storage and transmission caused by the large amount of data in the past, and it is becoming a mainstream way of expressing information. The continuous occurrence of hacker incidents and online piracy seriously restricts the further development of Internet applications. Therefore, the protection of image data has been paid more and more attention by the society. [0003] Due to its randomness and sensitivity to initial values, chaotic systems are increasingly used in image encryption. At present, the main encryption methods include scrambling ...

AI Technical Summary

Problems solved by technology

[0003] Due to its randomness and sensitivity to initial values, chaotic systems are increasingly used in image encryption. At this stage, the main encryption methods include scrambling image pixel values, scrambling pixel positions, or a combination of the two. However, a single chaotic system sometimes cannot meet the requirements of image encryption, and due to the emergence of selective plaintext attack, differential attack, segmentation attack and other attack methods, the key issue of encryption is also changing from the original single pursuit of large key space. Gradual shift to algorithms that are highly sensitive to both keys and plaintext

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