Computer Science

Computer Science ›› 2020, Vol. 47 ›› Issue (2): 276-280.doi: 10.11896/jsjkx.190100051

• Information Security • Previous Articles     Next Articles

Cryptanalysis of Medical Image Encryption Algorithm Using High-speed Scrambling and Pixel Adaptive Diffusion

YU Feng,GONG Xin-hui,WANG Shi-hong   

  1. (School of Science,Beijing University of Posts and Telecommunications,Beijing 100876,China)
  • Received:2019-01-07 Online:2020-02-15 Published:2020-03-18
  • About author:YU Feng,born in 1993,postgraduate.His main research interests include chaotic encryption;WANG Shi-hong,born in 1966,Ph.D,professor.Her main research interests include chaotic encryption.

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Abstract: Security is essential and important for every image encryption algorithm.Medical image encryption is a means to protect patients’ privacy.Analyzing the security of medical image encryption algorithm is very meaningful for the design of medical image encryption algorithm,enhancing the security of algorithm and promoting the application of medical image encryption algorithm.Recently,Hua et al.proposed a medical image encryption algorithm using high-speed scrambling and pixel adaptive diffusion.The key operation of the scheme is insertion of a random sequence around an image,then the random values are dispersed to the whole image by scrambling,finally,the whole image is scrambled by diffusion.Because different random values are generated in each encryption,even for one unchanged image,the cipher-image is different in every encryption such that Hua et al’s scheme is similar to one time one pad system.In this paper,the security of the algorithm was analyzed by differential cryptanalysis and chosen ciphertext attack in detail.The decryption process is analyzed theoretically by differential cryptanalysis and linear relationship is constructed between plain-images and cipher-images.Based on the linear relationship,a codebook is established,and the codebook attack breaks Hua et al’s algorithm.The size of the codebook is determined by the size of the cipher-image.If the size of the cipher-image is,the constructed codebook contains pairs of plain-image/cipher-image.The experimental results verify the theoretical analysis.To improve the security of Hua et al’s algorithm and to resist the differential cryptanalysis,an improved scheme was proposed.In the improved scheme,plaintext-related permutation matrices are introduced.The simulation and statistical results show that the improved scheme not only inherits the advantages of the original algorithm,but also resist the differentialcryptanalysis and the codebook attack.

Key words: Chaotic encryption, Codebook attack, Differential cryptanalysis, Image encryption, Medical image

CLC Number: 

  • TP391
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