ARIA is a 128-bit SPN block cipher selected as a Korean standard. This paper processes meet-in-the-middle attacks on reduced-round ARIA. Some 4-round and 5-round significant distinguishing properties which involve much fewer bytes parameters are proposed. Based on these better distinguishes, attacks on 7-round ARIA-192/256 and 8-round ARIA-256 are mounted with much lower complexities than previous meet-in-the-middle attacks. Furthermore, we present 7-round attack on ARIA-128 and 9-round attack on ARIA-256, which are both the first results for ARIA in terms of the meet-in-the-middle attack.
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