Medical image secure transmission method and system

Abstract

The present application belongs to the technical field of secret communication, and specifically relates to a medical image secure transmission method and system. An image hash value and a user key are used to generate a final encryption key and split the final encryption key into driving parameters, and an initial chaotic sequence is generated through iteration of a four-dimensional Logistic-Sine chaotic system. The chaotic sequence and the driving parameters are used to sequentially perform row / column permutation shift and double-round XOR diffusion on an image matrix, so that preliminary encryption is achieved. The preliminarily encrypted image is decomposed into bit planes and exchanged and recombined, so that bit-level confusion is achieved. A S-box is dynamically constructed using the chaotic sequence and a DNA encoding rule, and after cyclic shift, pixel replacement is performed on the bit plane encrypted image, and an encrypted image is output. Decryption is the reverse process of encryption. While ensuring the security requirements such as confidentiality and integrity of medical images, the present application significantly improves encryption and decryption efficiency through lightweight operations, and is suitable for real-time transmission scenarios of large-volume medical images.

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