对7轮ARIA-192的不可能差分分析
doi: 10.3724/SP.J.1146.2012.01615
Impossible Differential Cryptanalysis of 7-Round ARIR-192
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摘要: ARIA密码是2003年由韩国学者提出的新的分组密码算法，该密码与AES的设计原理相类似，并在2004年被选为韩国的分组密码标准。该文根据ARIA密码的结构特征，提出ARIA密码的一种新的7轮不可能差分攻击路径，首次实现了对ARIA-192的不可能差分攻击，攻击的时间复杂度为2176.2。同时，利用扩散层的相关性质降低攻击ARIA-256的时间复杂度为2192.2。Abstract: ARIA cipher is a new block cipher proposed by some South Korean experts in 2003. The design principle of ARIA is similar to the AES. ARIA is established as a Korean Standard block cipher algorithm by Korean Agency for Technology and Standards. In this paper, a new impossible differential attack on 7 rounds of the ARIA cipher is presented. By this attack, 7-round ARIA-192 is breakable with a data complexity of about2176.2 encryptions,while the previous best impossible differential attack on ARIA broke on 7-round ARIA-256. Then some characters on diffusion layer are used to reduce the complexity of the ARIA-256 to 2192.2.
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Key words:
- Block cipher /
- Impossible differential attack /
- Precomputation /
- ARIA cipher
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