Improved Impossible Differential Attack on 7-round Reduced ARIA-256

• Xuan Shen,
• Jun He,

Vol. 13, No. 11, November 30, 2019
10.3837/tiis.2019.11.027, Download Paper (Free):

• ARIA
• impossible differential attack
• data complexity
• Time Complexity
• early-abort technique

Abstract

ARIA is an involutory SPN block cipher. Its block size is 128-bit and the master key sizes are 128/192/256-bit, respectively. Accordingly, they are called ARIA-128/192/256. As we all know, ARIA is a Korean Standard block cipher nowadays. This paper focuses on the security of ARIA against impossible differential attack. We firstly construct a new 4-round impossible differential of ARIA. Furthermore, based on this impossible differential, a new 7-round impossible differential attack on ARIA-256 is proposed in our paper. This attack needs 2118 chosen plaintexts and 2210 7-round encryptions. Comparing with the previous best result, we improve both the data complexity and time complexity. To our knowledge, it is the best impossible differential attack on ARIA-256 so far.

Statistics

Cite this article