The DICOM system contains patients' personal privacy and may present a risk of information leakage in telemedicine diagnostics. In order to solve the security problem of the DICOM system, we propose a medical image encryption method based on the cross-diffusion of the logistic map and the Chebyshev map. We first parse the DICOM image and read the data elements, and then we use the logistic map and the Chebyshev map to generate a key. Then, we cross-use these two sequences for further image encryption diffusion. Finally, we conduct in-depth experiments and comparisons with existing algorithms to validate the characteristics of high security and low correlation of adjacent pixels of the proposed encryption algorithm.

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In order to be more effectively resist differential power analysis attacks, the improved fixed value masking algorithm is proposed for resource-constrained smart card based on fixed value masking and random masking. Firstly, a number of random numbers are selected and prestored in on-chip ROM for generating the corresponding byte-substitution table. It does not increase much power and hardware resources because the byte-substitution table is pregenerated. Finally, experiments in terms of the second-order differential power analysis attacks have been carried outon the improved fixed masking. The experimental results show that the proposed AES algorithm can be effectively resistant to the side-channel attacks with lower computing expenses and higher security.