Journal
SIGNAL PROCESSING-IMAGE COMMUNICATION
Volume 39, Issue -, Pages 151-158Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.image.2015.09.006
Keywords
Cryptanalysis; Spatiotemporal chaos; Image encryption
Categories
Funding
- Ministry of Higher Education, Scientific Research and Information Technology and Communication(Tunisia)
- Ministry of Higher Education and Scientific Research (Egypt) [4-13-A1]
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In this paper, we describe a cryptanalysis of image encryption scheme recently proposed by Chun-Yan Song, Yu-Long Qiao, and Xing-Zhou Zhang. The scheme is based on a spatiotemporal chaos with a dynamic keystream generator, and its security is claimed to rely in utilized the plainimage in the keystream generation process to obtain a different keystream for every plainimage/cipherimage pair. However, two flaws are investigated and prove that the security of the proposal against chosen plaintext attack is groundless. Simulations conducted demonstrate that the plainimage can be recovered under partial attack with an acceptable perceptual quality. Moreover, a total break is possible, but a large number of plain-image/cipher-image pairs is needed. (C) 2015 Elsevier B.V. All rights reserved.
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