Cryptanalysis of a High-Definition Image Encryption Based on AES Modification


Yap, Wun She and Phan, Raphael Chung Wei and Goi, Bok Min (2016) Cryptanalysis of a High-Definition Image Encryption Based on AES Modification. Wireless Personal Communications, 88 (3). pp. 685-699. ISSN 0929-6212

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Wadi and Zainal recently proposed a high definition image encryption algorithm based on a modified AES-128 block cipher in (Wirel Pers Commun 79(2):811–829, 2014). In this paper, we show that the core component of their image encryption algorithm, a modified AES-128 cipher, is insecure against impossible differential attack. The proposed impossible differential attack on the full rounds of the modified AES-128 cipher has a time complexity of around 288.74 encryptions with 2114.06 chosen plaintexts and 299 bytes of memory, in contrast to the expected security of 2128. The existence of such an attack disproves the claims made by the designers that their modified AES-128 cipher improves the security of the AES cipher and that it can subsequently be used to construct a secure image encryption scheme. The root cause of this attack, some other issues with the modified AES cipher and possible solutions are described to serve as important remarks in designing a secure image encryption scheme.

Item Type: Article
Uncontrolled Keywords: Image encryption, Modified AES, Cryptanalysis, Impossible differential attack
Subjects: Q Science > QA Mathematics > QA71-90 Instruments and machines > QA75.5-76.95 Electronic computers. Computer science
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Suzilawati Abu Samah
Date Deposited: 20 Feb 2017 02:53
Last Modified: 20 Feb 2017 02:53


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