Differential cryptanalysis of a medical image cryptosystem with multiple rounds

作者：Chen, Lei; Wang, Shihong^*

来源：Computers in Biology and Medicine, 2015, 65: 69-75.

DOI：10.1016/j.compbiomed.2015.07.024

• Chaos-based image encryption
• Differential cryptanalysis
• Permutation-substitution architecture
• Discrete cat map

Recently, Fu et al. proposed a chaos-based medical image encryption scheme that has permutation-substitution architecture. The authors believe that the scheme with bit-level cat map shuffling can be achieved at high level of security even if it is only applied with a few encryption rounds. However, we find that the scheme cannot resist differential cryptanalysis. The differential cryptanalysis shows that the security of the original scheme depends only on permutation key instead of on all of the keys. Moreover, 17 chosen plain-images can reveal equivalent permutation key for 1-round and 2-round encryption. We propose a novel analysis method called double differential cryptanalysis comparison (DDCC) that is valid to break multi-round encryption with 16N(2) + 1 chosen plain-images, where N-2 is the size of the image. We also point out several weaknesses of the cryptosystem. The theoretical analysis and simulation results indicate that the encryption scheme is insecure.

• 出版日期2015-10-1
• 单位北京邮电大学