Image encryption method based on two-dimensional Arnold transformation

Abstract

The present invention provides an image encryption method based on two-dimensional Arnold transformation, and belongs to the technical field of encryption. The method comprises: expressing a two-dimensional planar image with a binary function I=f (x, y), performing two-dimensional Arnold transformation on the image f(x,y), and changing a layout of a gray value of an original image by changing pixel coordinates; and taking the original image as a matrix, wherein an image subjected to Arnold transformation is ''messy'', and due to periodicity of Arnold transformation, continuing using Arnold transformation, which can reproduce the image, so as to decrypt the image. According to the method, periodicity of Arnold transformation is used, that is, the original image can be reproduced when iteration is performed to a certain step. Compared with other encryption methods, image encryption and decryption become easier, so that image encryption efficiency is greatly increased.

Description

technical field [0001] The invention relates to the technical field of encryption, in particular to an image encryption method based on two-dimensional Arnold transformation. Background technique [0002] With the increasing openness, sharing and interconnection of computer networks, the Internet has been rapidly developed and applied, and the importance of the network and its impact on society are also increasing. At the same time, the security and confidentiality of the network has become an increasingly serious practical problem. In recent years, both official and non-governmental organizations have attached great importance to issues such as safe storage, confidential transmission, and authenticity verification of information. [0003] Common encryption algorithms, such as DES, AES, RSA, etc., are proposed for text and data encryption. For encryption in terms of digital images, it is also common to adopt the idea of ​​these text encryption techniques. However, there a...

AI Technical Summary

Problems solved by technology

Digital images are generally stored in the data format of a two-dimensional array, and text encryption technology requires the data to be encrypted to be converted into a binary data stream first. If the image is large, a certain amount of image preprocessing time is required, which reduces the encryption efficiency.