Cryptanalysis of an image encryption scheme based on the Hill cipher |
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| Authors: | Cheng-qing Li Dan Zhang Guan-rong Chen |
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| Institution: | [1]Department of Electronic Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong, China [2]School of Computer Science and Technology, Zhejiang University; Hangzhou 310027, China |
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| Abstract: | This paper studies the security of an image encryption scheme based on the Hill cipher (Ismail et al., 2006) and reports its following problems: (1) There is a simple necessary and sufficient condition that makes a number of
secret keys invalid; (2) It is insensitive to the change of the secret key; (3) It is insensitive to the change of the plain-image;
(4) It can be broken with only one known/chosen plaintext; (5) It has some other minor defects. The proposed cryptanalysis
discourages any use of the scheme in practice.
Project supported by the National Basic Research Program of China (No. 2006CB303104) and the City University of Hong Kong
under the SRG Project, China (No. 7002134) |
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| Keywords: | Cryptanalysis Encryption Hill cipher Known-plaintext attack Chosen-plaintext attack |
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