Medical image encryption using high-speed scrambling and pixel adaptive diffusion

• DOI: 10.1016/j.sigpro.2017.10.004
• Publication Date: 2017-10-05T05:31:24Z
• Authors: Zhongyun Hua; Shuang Yi; Yicong Zhou
• Keywords: 0202 electrical engineering, electronic engineering, information engineering; 02 engineering and technology

We propose an encryption scheme to protect medical images using high-speed scrambling and pixel adaptive diffusion.It has a high security level as it can encrypt an identical image into different cipher-images, even when using the same secret key.We provide two implementations, which have high efficiency in hardware platforms and software platforms, respectively.The proposed encryption scheme has high security level, faster speed, and better robustness than several typical encryption schemes. This paper presents a new encryption scheme of protecting medical images. It has high efficiency and shows robustness of defending some impulse noise and data loss. First, some random data are inserted into surroundings of the image. Then, two rounds of high-speed scrambling and pixel adaptive diffusion are performed to randomly shuffle neighboring pixels and spread these inserted random data over the entire image. The proposed encryption scheme can be directly applied to medical images with any representation format. We provide two kinds of operations to implement the pixel adaptive diffusion: bitwise XOR and modulo arithmetic. The former has high efficiency in hardware platforms while the latter can achieve fast speed in software platforms. Simulations and evaluations show that both encryption schemes using bitwise XOR and modulo arithmetic have high security levels, can achieve much faster speeds, and can better adapt to impulse noise and data loss interference than several typical and state-of-the-art encryption schemes.