A medical CT image secret sharing method

Abstract

The invention discloses a medical CT image secret sharing method. The method comprises an encryption stage and a decryption stage, and is characterized by in the encryption phase, firstly, through sparse singular value decomposition, obtaining a CT image sub-graph with the definition corresponding to the permission level of a receiver and a decimal matrix; obtaining a key of two-dimensional Logistic mapping through the decimal matrix, and generating two chaotic sequences by using the mapping; and performing scrambling operation on pixel positions of the CT image sub-images to obtain a snowflake image, then segmenting the snowflake image into five function value matrixes through a polynomial, and finally embedding elements in the function value matrixes into low two bits of a camouflage image selected by a user to obtain five shadow images. According to the scheme, the purpose of completely recovering the secret CT image subgraphs can be achieved only by enabling the receiver obtainingthe five shadow graphs and the receiver storing the secret keys to participate in decryption at the same time, and the method has very high practical value and popularization value.

Description

technical field [0001] The invention belongs to the field of medical information security, and in particular relates to a method for secretly sharing medical CT images. Background technique [0002] With the rapid development of telemedicine technology, more and more patients benefit from it. The remote transmission of CT images is an important part of telemedicine, and the wide application of telemedicine is accompanied by the storage and transmission of a large number of CT images on the Internet. Due to the high acquisition cost and great scientific value of CT images, CT images of some important figures with great influence in the political, military and economic fields also have important confidentiality value. The theft and tampering of CT images during transmission will cause huge losses. Therefore, it is of great practical value to encrypt CT images before transmitting them. Current CT image encryption schemes cannot effectively protect CT images from theft and ta...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for secret sharing of medical CT images, which mainly solves the shortcomings of the existing CT image encryption schemes in the prior art due to the weak ability to resist plaintext or selective plaintext attacks, which cannot be used in practical applications. Effectively protect CT images from theft and tampering

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