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A Secure and Fast Image Encryption Scheme Based on Double Chaotic S-Boxes
Open AccessArticle

On the Security of a Latin-Bit Cube-Based Image Chaotic Encryption Algorithm

School of Automation, Guangdong University of Technology, Guangzhou 510006, China
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Entropy 2019, 21(9), 888; https://doi.org/10.3390/e21090888
Received: 15 August 2019 / Revised: 6 September 2019 / Accepted: 9 September 2019 / Published: 12 September 2019
(This article belongs to the Special Issue Entropy in Image Analysis II)
In this paper, the security analysis of an image chaotic encryption algorithm based on Latin cubes and bit cubes is given. The proposed algorithm adopts a first-scrambling-diffusion- second-scrambling three-stage encryption scheme. First, a finite field is constructed using chaotic sequences. Then, the Latin cubes are generated from finite field operation and used for image chaotic encryption. In addition, according to the statistical characteristics of the diffusion image in the diffusion stage, the algorithm also uses different Latin cube combinations to scramble the diffusion image for the second time. However, the generation of Latin cubes in this algorithm is independent of plain image, while, in the diffusion stage, when any one bit in the plain image changes, the corresponding number of bits in the cipher image follows the change with obvious regularity. Thus, the equivalent secret keys can be obtained by chosen plaintext attack. Theoretical analysis and experimental results indicate that only a maximum of 2.5 × w × h 3 + 6 plain images are needed to crack the cipher image with w × h resolution. The size of equivalent keys deciphered by the method proposed in this paper are much smaller than other general methods of cryptanalysis for similar encryption schemes. View Full-Text
Keywords: image chaotic encryption; cryptography; Latin cube; bit cube; chosen plaintext attack image chaotic encryption; cryptography; Latin cube; bit cube; chosen plaintext attack
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Zhang, Z.; Yu, S. On the Security of a Latin-Bit Cube-Based Image Chaotic Encryption Algorithm. Entropy 2019, 21, 888.

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