Title: Related-key cryptanalysis on 7-round AES-128/192

Authors: Jie Cui; Hong Zhong; Runhua Shi; Jiankai Wang

Addresses: School of Computer Science and Technology, Anhui University, No. 111 Jiu Long Road, Hefei, Anhui Province, China ' School of Computer Science and Technology, Anhui University, No. 111 Jiu Long Road, Hefei, Anhui Province, China ' School of Computer Science and Technology, Anhui University, No. 111 Jiu Long Road, Hefei, Anhui Province, China ' School of Natural Sciences, Anhui Agricultural University, No. 130 West Changjiang Road, Hefei, Anhui Province, China

Abstract: AES is the most widely used block cipher today, and its security is one of the most important issues in cryptanalysis. In this paper the authors present two attacks on 7-round AES-128/192 to improve the known cryptanalysis by changing the order of round transformations, using the alternative representation of the round keys, exploiting the relationship of keys, designing the key difference pattern properly. We reduce complexity to 2160 and 2104 respectively using the improved attack methods. Our attacks are faster than the best previous attacks.

Keywords: Advanced Encryption Standard; AES; Rijndael; square attacks; related-key cryptanalysis; cryptography; block cipher; round keys; key relationships; key difference patterns; security.

DOI: 10.1504/IJESDF.2015.069609

International Journal of Electronic Security and Digital Forensics, 2015 Vol.7 No.2, pp.166 - 178

Received: 07 Jan 2015
Accepted: 02 Mar 2015
Published online: 28 May 2015 *

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