Image block encryption method and system based on chaos and computer-generated holography

Abstract

The invention provides an image block encryption method and system based on chaos and computer-generated holography, and solves the problem that, in the prior art, an image encryption mode cannot balance encryption security and encryption operation flexibility. The technical scheme of the invention is characterized in that: firstly, three-channel decomposition is performed on a to-be-encrypted plaintext image; three single-channel grey-scale maps are segmented into sub-images with the same size; a part of the sub-images are randomly selected, a pseudo-random sequence is generated based on a hyper-chaotic system, pixel scrambling is performed on the sub-images, and then pixel diffusion is performed, wherein scrambling and diffusion operations improve the decoding difficulty, and, in addition, a block encryption technology is used in the process, and therefore the encryption key space is larger, and the effect is better; remaining sub-images are then converted into a hologram by using a phase restoration GS algorithm in a computer-generated hologram, wherein the process of converting the remaining sub-images into the hologram is another encryption process. Thus, the operation in a computer system is easy, and the encryption operation flexibility is also improved.

Description

technical field [0001] The present invention relates to the technical field of image encryption, more specifically, to an image block encryption method and system based on chaos and computational holography. Background technique [0002] In the 21st century, image information security has gradually become a hot spot of social concern. During the process of storage, processing and transmission of image information, it is very likely to be intercepted, tampered with and forged by a third party. There is a great threat. In this era of information explosion, more and more digital images need to be stored and transmitted more confidentially. At the same time, with the development of multimedia, the confidentiality of image information has also been paid more and more attention. Efficient and safe image encryption methods are very important and urgent. [0003] Due to the strong redundancy of the image and the strong correlation between adjacent pixels, traditional encryption al...

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Problems solved by technology

[0005] In order to solve the problem that the current image encryption method cannot take into account both encryption security and encryption operation flexibility, the present invention proposes a chaotic and computationally holographic image block encryption method and system, using block encryption, the encryption effect is better, and the operation Simple, can well guarantee the confidentiality and security of image information in the process of use and transmission

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