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

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...

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Bibliographic Details
Published in:Entropy (Basel, Switzerland) Switzerland), 2018-12, Vol.20 (12), p.974
Main Authors: Huang, Xiaoling, Ye, Guodong
Format: Article
Language:English
Subjects:
Algorithms
Chaos theory
chaotic map
Diffusion
image encryption
information entropy
Insertion
Methods
Permutations
random insertion
Random numbers
time-delay
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Summary: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.
ISSN:1099-4300
1099-4300
DOI:10.3390/e20120974