对ARIA算法的结构特征进行了研究，利用“多重集”并结合截断差分的性质，将预计算的参数由30个减少到16个，构造新的4轮中间相遇区分器，有效地改进了ARIA-192算法的7轮中间相遇攻击。新攻击的预计算复杂度为2135.3，时间复杂度约为2123。%A study on the structure of ARIA cipher is presented. A new 4-round distinguishing property for the meet-in-the-middle attack on ARIA cipher is presented by making use of the multiset and the truncated differential char-acteristic. The new distinguishing property improves the meet-in-the-middle attack on 7 rounds of ARIA-192 cipher ef-fectively by reducing the 30 parameters to 16. The new attack requires a precomputation complexity of 2135.3 and a time complexity of about 2123.
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