Medical Image Encryption Based on Stream Cipher Algorithm and Krill Group

Chu Zhao ； Shoulin Yin ； Hang Li ； Yang Sun

《International Journal of Network Security》 22卷2期 (2020/03) Pp. 314-320

https://doi.org/10.6633/IJNS.202003_22(2).15

摘要

The traditional image encryption algorithm is with low key sensitivity, low efficiency, low security, image scrambling and diffusion and high correlation. When using stream cipher to encrypt medical, the key sequence is too long and difficult to store and distribute. Therefore, this paper puts forward a new stream cipher method to encrypt medical image. First, medial image is coded as the text form. And then, we use the mutated character encoding table to encode text as the plaintext. Finally, we use krill group-based stream cipher algorithm to encrypt plaintext. By comparing the new method with the state- of-the-art encryption methods, experimental results show that the new method has greatly shortened the length of storing and distributing key sequence. The new algorithm has certain advantages in statistical performance, robust performance and key sensitivity, and also meets the requirements of image security and real-time performance.

關鍵字

Character Encoding ； Krill Group ； Medical Image Encryption ； Stream Cipher Algorithm