Image encryption method and apparatus

Abstract

The invention provides an image encryption method and apparatus. According to the method, by adopting a target image matrix of sparse representation according to a preset orthogonal sparse base and anoriginal image matrix of a plaintext image, the computational complexity is reduced. A measurement result matrix is obtained by performing compression measurement on the target image matrix through acompressed sensing model, wherein the compressed sensing model is obtained by performing tensor product processing according to a chaotic matrix and a generalized permutation matrix; and the compressed sensing model is obtained by performing the tensor product processing by matrixes generated by two chaotic systems separately, so the compressed sensing model has interrelation that is small enough, and thus the possibility of successful restoration is improved. Quantitative processing is performed on the measurement result matrix to obtain a quantitative matrix subjected to the quantitative processing; and forward diffusion processing and reverse diffusion processing are performed on the quantitative matrix to obtain an encrypted image matrix, the encrypted image matrix corresponds to a ciphertext image, and the forward diffusion processing and the reverse diffusion processing can ensure more uniform image energy distribution and further improve the system security and the image encryption performance.

Description

technical field [0001] The invention relates to information security technology, in particular to an image encryption method and device. Background technique [0002] With the rapid development of information network technology, the application of multimedia technology in various fields is changing with each passing day. Digital image is one of the most popular forms of multimedia at present, and it is widely used in politics, economy, national defense, education and so on. For some special fields, such as military, commercial and medical, there are high confidentiality requirements, and it is necessary to prevent digital images from being maliciously intercepted, tampered with or illegally copied by a third party during transmission. [0003] In the existing encryption algorithm, as long as the signal of the digital image is sparse in a certain transformation domain, the encryption device can project the high-dimensional signal of the transformed digital image to The encr...

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Problems solved by technology

[0004] However, in the existing compressed sensing algorithm, the entire observation matrix is ​​used as the encryption key, and the consumption of the key is too large, which is not conducive to the transmission, storage and memory of the key.

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