On the effective subkey space of some image encryption algorithms using external key


Yap, Wun She and Phan, Raphael Chung Wei and Goi, Bok Min and Yau, Wei Chuen and Heng, Swee Huay (2016) On the effective subkey space of some image encryption algorithms using external key. Journal of Visual Communication and Image Representation, 40 (A). pp. 51-57. ISSN 1047-3203

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One of the general ways in designing a secure image encryption algorithm based on chaos theory is to derive a number of round subkeys from the Key Schedule algorithm under the control of an external secret key. A compulsory condition for the security of an image encryption algorithm is that the length of the external secret key should be sufficiently long in terms of bitlength. However, the sufficiently long secret key is not a guarantee that the algorithm is secure. In this paper, we emphasize the importance in designing a secure Key Schedule algorithm for such image based encryption techniques. Notably, we show why the effective space spanned by the subkeys should never be smaller than the external secret key space. To highlight the importance of this, we present our attacks on three recently proposed image encryption schemes.

Item Type: Article
Uncontrolled Keywords: Image encryption, Chaos theory, Key schedule, Attacks, Key space
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA1501-1820 Applied optics. Photonics
Divisions: Faculty of Engineering (FOE)
Faculty of Information Science and Technology (FIST)
Depositing User: Ms Suzilawati Abu Samah
Date Deposited: 13 Dec 2017 16:28
Last Modified: 13 Dec 2017 16:28
URII: http://shdl.mmu.edu.my/id/eprint/6632


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