Image encryption method and device

Abstract

The invention provides an image encryption method and device. The method comprises the following steps: acquiring a Hash function value of a plaintext image, and acquiring a first key corresponding tothe plaintext image according to the Hash function value; performing sparse transformation processing on the plaintext image to obtain a discrete matrix corresponding to the plaintext image; performing scrambling processing on the discrete matrix through the first key to obtain a scrambled intermediate matrix, wherein the intermediate matrix corresponds to the scrambled plaintext image; and measuring the intermediate matrix by means of half-tensor compressed sensing, and outputting a first encrypted matrix, wherein the first encrypted matrix corresponds to the compressed and encrypted plaintext image. Through adoption of the method provided by the invention, the storage and transmission amounts of image data during transmission are reduced effectively.

Description

technical field [0001] The invention relates to the technical field of image transmission, in particular to an image encryption method and device. Background technique [0002] With the rapid development of computer communication technology, there are more and more applications of Body Area Network (BAN) technology for remote monitoring of human body parameters. Due to the particularity of the application objects of the body area network, the data transmitted wirelessly between the nodes in the body area network needs to be encrypted to avoid the leakage of personal privacy. [0003] At present, the encryption method of image data is to design a corresponding measurement matrix for each measured data, and then process the measurement matrix through chaotic encryption to realize the encryption of image data. [0004] However, this encryption method in the prior art has a complex processing process and requires storage and transmission of a large amount of measurement data. W...

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Problems solved by technology

[0004] However, this encryption method in the prior art has a complex processing process and requires storage and transmission of a large amount of measurement data. When applied to a body area network, it will cause a long time for data transmission between nodes in the body area network, which greatly consumes The power of the body area network, which affects the use of the body area network

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