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An Improved simple power attack against Camellia's Key Schedule

Wuhan University Journal of Natural Sciences 2008年第5期13卷 591-594页

作者： LIU Shuanggen NI Haiying HU Yupu LIAO Yunyan Key Laboratory of Computer Network and InformationSecurity of Ministry of Education Xidian University Xi＇an710071 Shaanxi China College of Computer Information Engineering JiangxiNormal University Nanchang 330022 Jiangxi China

This paper presents an improved simple power attack against the key schedule of Camellia. While the original attack required an exact determination of the Hamming weight of intermediate data values based on power measurements, in this paper, two types of the simple power attack are presented and shown to be tolerant of errors that might occur in the Hamming weight determinations. In practical applications of the attack, such errors are likely to occur due to noise and distortion in the power measurements and their mapping to the Hamming weights of the data. To resist these attacks, the required design rationale of key schedules and several practical countermeasures are suggested.

关键词： simple power attack Camellia key schedule Hamming weight attack

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Secure and efficient elliptic curve cryptography resists side-channel attacks

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Journal of Systems Engineering and Electronics 2009年第3期20卷 660-665页

作者： Zhang Tao Fan Mingyu Zheng Xiaoyu Westone Information Industry Inc Chengdu 610041 P. R. China School of Computer Science & Engineering Univ. of Electronic Science and Technology of China Chengdu 610054 P. R. China School of Electronic Engineering Univ. of Electronic Science and Technology of China Chengdu 610054 P. R. China

An embedded cryptosystem needs higher reconfiguration capability and security. After analyzing the newly emerging side-channel attacks on elliptic curve cryptosystem （ECC）, an efficient fractional width-w NAF （FWNAF） algorithm is proposed to secure ECC scalar multiplication from these attacks. This algorithm adopts the fractional window method and probabilistic SPA scheme to reconfigure the pre-computed table, and it allows designers to make a dynamic configuration on pre-computed table. And then, it is enhanced to resist SPA, DPA, RPA and ZPA attacks by using the random masking method. Compared with the WBRIP and EBRIP methods, our proposals has the lowest total computation cost and reduce the shake phenomenon due to sharp fluctuation on computation performance.

关键词： elliptic curve cryptography side channel attack simple power attack differential power attack refined power analysis zero-point power analysis.

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