Towards Optimized DFA Attacks on AES under Multibyte Random Fault Model

Towards Optimized DFA Attacks on AES under Multibyte Random Fault Model
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多字节随机故障模型下 AES 的优化 DFA 攻击

DOI:
10.1155/2018/2870475
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发表时间:
2018-08
影响因子:
--
通讯作者:
Wang Jian
Wang Jian
中科院分区:
计算机科学4区
文献类型:
--
作者:
Wang Ruyan;Meng Xiaohan;Li Yang;Wang Jian

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差分故障分析(DFA)是从真实密码设备中恢复密钥的最实用的方法之一。特别是,高级加密标准 (AES) 上的 DFA 已经针对单字节和多字节故障模型进行了多年的大量研究。对于 AES,第一个提出的 DFA 攻击需要 6 对密文来识别多字节故障模型下的密钥。到目前为止,2017年提出的多字节故障模型下最高效的DFA可以在3对密文内完成大部分攻击。然而,我们注意到,由于没有设置明确的优化目标,因此攻击并未完全优化。在这项工作中,我们引入了两个优化目标:最少的密文对和最小的计算复杂度。针对这些目标,我们设法找出相应的优化密钥恢复策略,进一步提高DFA对AES的攻击效率。基于我们对AES的DFA攻击的研究,可以完成对AES更准确的安全评估。考虑到故障分布的变化,对攻击的改进进行了分析和验证。
Differential Fault Analysis (DFA) is one of the most practical methods to recover the secret keys from real cryptographic devices. In particular, DFA on Advanced Encryption Standard (AES) has been massively researched for many years for both single-byte and multibyte fault model. For AES, the first proposed DFA attack requires 6 pairs of ciphertexts to identify the secret key under multibyte fault model. Until now, the most efficient DFA under multibyte fault model proposed in 2017 can complete most of the attacks within 3 pairs of ciphertexts. However, we note that the attack is not fully optimized since no clear optimization goal was set. In this work, we introduce two optimization goals as the fewest ciphertext pairs and the least computational complexity. For these goals, we manage to figure out the corresponding optimized key recovery strategies, which further increase the efficiency of DFA attacks on AES. A more accurate security assessment of AES can be completed based on our study of DFA attacks on AES. Considering the variations of fault distribution, the improvement to the attack has been analyzed and verified.
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