Novel Fast Improved 3D S-Box-Based Cryptography Algorithm for Protecting DICOM Images

Abstract

Data encryption is one of the security solutions used to protect secret data. The use of image encryption techniques in DICOM (digital imaging and communications in medicine) data to secure it in unprotected networks or storage is the focus of this chapter. Therefore, based on the improvement of a 3D (three dimension) s-box proposed previously, the authors provide a novel efficient images encryption method for medical imaging. The technique also encrypts the DICOM tags and Jpeg compressed DICOM imaging because 512-bit-based blocks of data are processed. A function named encrypt_block() is used for the diffusion and confusion. This function processes a block with subblocks each of 8-bit. For each subblock it uses the s-box for data transformation. The cryptanalysis of the proposed encryption system shows its strength and security. The runtime and the speed of the algorithm demonstrate its low time complexity, which makes it suitable for much electronics hardware, especially embedded systems.