Color picture encryption algorithm and device

Abstract

The embodiments of the invention provide a color picture encryption algorithm and device. The method comprises the steps of: acquiring four one-dimensional vectors corresponding to four gray images ofa plain text image, and generating a two-dimensional matrix from the four one-dimensional vectors; performing iterative operation on the acquired initial key to obtain a first chaotic sequence and asecond chaotic sequence, the iterative operation comprising two-dimensional Henon mapping and two-dimensional Logistic mapping; randomly extracting pixels of the two-dimensional matrix through the first chaotic sequence, and performing operation on the extracted pixels and the second chaotic sequence to obtain a third chaotic sequence; performing operation on the third chaotic sequence through four-dimensional Lorenz mapping to obtain a fourth chaotic sequence, and rounding down the fourth chaotic sequence to obtain an encrypted password; forwardly diffusing the gray images respectively through the encrypted password, then scrambling the diffused gray images through three-dimensional Baker mapping, and backwardly diffusing the scrambled gray images through the encrypted password to obtaina cipher text image.

Description

Technical field [0001] The invention relates to the technical field of picture encryption, in particular to a color picture encryption algorithm and device. Background technique [0002] In recent years, with the rapid development of the Internet, more and more information and data are transmitted through the Internet. While transmitting data on the Internet, one issue must first be considered: data security. How to prevent data and information from being destroyed or stolen during transmission and ensure their integrity. At the same time, because of the rapid development of computer science and technology, disciplines such as cryptography and information security have emerged. The method of protecting data mentioned in it: encryption has received extensive attention and applications. Therefore, the application of encryption methods to protect data is a feasible way. And because Internet data is mostly non-linear data such as voice, digital image and video, in particular, digi...

AI Technical Summary

Problems solved by technology

When transmitting data on the Internet, we must first consider a problem: data security.

At present, there are many algorithms applied to image encryption. However, these algorithms have various defects, such as the two-level key system is vulnerable to exhaustive attacks; some technologies are strong in resisting differential attacks, but the operation speed is slow; some are sensitive Strong performance, large key space, but poor resistance to clipping attacks and noise pollution, etc.

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