Color image encryption method and device

Abstract

The embodiments of the present invention disclose a color image encryption method and a device. The method comprises the following steps of subjecting a RGB component of a to-be-encrypted plaintext color image to the two-dimensional pixel scrambling treatment by using a non-periodic two-dimensional Cat transformation with a pixel value to be unchanged; subjecting the gray value of each pixel of the plaintext color image after the scrambling treatment to the operation of XOR together with three groups of chaotic sequences obtained through the mapping of Henon_Kent so as to obtain intermediate ciphertext components; subjecting an intermediate ciphertext matrix formed by intermediate ciphertext components to the gray value exchange of pixels by using the non-periodic three-dimensional Cat transformation, and iteratively conducting the operation for t times (t is a positive integer); successively circulating and executing the above steps for T times (T is a positive integer), and outputting the encrypted image of the plaintext color image. The key space is enlarged, so that the security of color image encryption is improved. The method and the device are good in robustness, and variousattack means can be effectively resisted.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of image processing, and in particular, to a color image encryption method and device. Background technique [0002] With the rapid development of Internet technology and image processing technology, users have higher and higher requirements for the security of digital audio, digital image and other multimedia information transmission, digital image encryption technology has been developed accordingly, and the corresponding digital image security transmission issues is also becoming more and more important. [0003] Traditional encryption algorithms, such as AES (Advanced Encryption Standard Algorithm), DES (Data Encryption Standard Encryption Algorithm), and RSA (Public Key Encryption Algorithm) algorithms require a lot of computing time to encrypt data images, and there are potential security risks. Due to chaos The system has the characteristics of pseudo-randomness and sensitiv...

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Problems solved by technology

[0003] Traditional encryption algorithms, such as AES (Advanced Encryption Standard Algorithm), DES (Data Encryption Standard Encryption Algorithm), and RSA (Public Key Encryption Algorithm) algorithms require a lot of computing time to encrypt data images, and there are potential security risks. Due to chaos The system has the characteristics of pseudo-randomness and sensitivity to the initial value, which can avoid the above problems to a certain extent. The image encryption method based on the chaotic system was born.

[0004] The existing technology generally uses a single low-dimensional chaos method to encrypt images. Since the key space of a single low-dimensional chaos is small, the number of keys is relatively small, resulting in poor security and cannot successfully resist common Attacks, such as statistical characteristic analysis attacks, differential attacks, etc.

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