Medical image privacy protection method applied to DICOM format

Abstract

The invention discloses a medical image privacy protection method applied to a DICOM format. The medical image privacy protection method comprises the following steps: firstly, constructing a chaoticsystem; generating an initial value and a system parameter of the chaotic system by using a hash function, and performing spatial scrambling operation on the original plaintext image; calculating a new round of chaotic system initial value and system parameters, and performing diffusion and bit shift operation on the scrambled image to eliminate statistical characteristics between plaintexts; performing XOR operation on the shifted intermediate ciphertext to further enhance the correlation between ciphertext pixels and an algorithm, and finally obtaining an encrypted ciphertext image; and finally, encrypting the tag information of the DICOM file. The method provided by the invention has very strong robustness for selecting plaintext attacks, key brute force attacks and differential analysis attacks.

Description

technical field [0001] The invention belongs to the technical field of information security, and relates to an image encryption method, in particular to a medical image encryption method in DICOM format. Background technique [0002] DICOM (Digital Imaging and Communications in Medicine) is medical digital imaging and communication, which is widely used in medical imaging equipment, and medical images of patients are also stored in DICOM file format. However, medical images are vulnerable to hackers during the transmission process, and the privacy of patients is leaked. Therefore, in order to protect the personal privacy information of patients, it is more and more important to encrypt medical images in DICOM format. [0003] The DICOM file is divided into two parts, one part is the front label that records the patient's personal privacy information, and the other part is the image pixel part, so the text and image information must be encrypted at the same time during the e...

AI Technical Summary

Problems solved by technology

For a fixed encryption algorithm, the key for each encryption is the same, and it is difficult to achieve the encryption effect of "one-time pad", so as long as there are enough samples, the algorithm can be deciphered

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