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Entropy 2018, 20(12), 974;

An Image Encryption Algorithm Based on Time-Delay and Random Insertion

Faculty of Mathematics and Computer Science, Guangdong Ocean University, Zhanjiang 524088, China
Author to whom correspondence should be addressed.
Received: 19 November 2018 / Revised: 9 December 2018 / Accepted: 13 December 2018 / Published: 15 December 2018
(This article belongs to the Special Issue Entropy in Image Analysis)
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An image encryption algorithm is presented in this paper based on a chaotic map. Different from traditional methods based on the permutation-diffusion structure, the keystream here depends on both secret keys and the pre-processed image. In particular, in the permutation stage, a middle parameter is designed to revise the outputs of the chaotic map, yielding a temporal delay phenomena. Then, diffusion operation is applied after a group of random numbers is inserted into the permuted image. Therefore, the gray distribution can be changed and is different from that of the plain-image. This insertion acts as a one-time pad. Moreover, the keystream for the diffusion operation is designed to be influenced by secret keys assigned in the permutation stage. As a result, the two stages are mixed together to strengthen entirety. Experimental tests also suggest that our algorithm, permutation– insertion–diffusion (PID), performs better when expecting secure communications for images. View Full-Text
Keywords: image encryption; time-delay; random insertion; information entropy; chaotic map image encryption; time-delay; random insertion; information entropy; chaotic map

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Huang, X.; Ye, G. An Image Encryption Algorithm Based on Time-Delay and Random Insertion. Entropy 2018, 20, 974.

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