Development of an on-chip micro shielded-loop probe to evaluate performance of magnetic film to protect a cryptographic LSI from electromagnetic analysis

被引:11
作者
Yamaguchi, Masahiro [1 ]
Toriduka, Hideki [1 ]
Kobayashi, Shoichi [1 ]
Sugawara, Takeshi [2 ]
Hommaa, Naofumi [2 ]
Satoh, Akashi [3 ]
Aoki, Takafumi [2 ]
机构
[1] Tohoku Univ, Dept Elect & Commun Engn, Grad Sch Engn, Aoba Ku, 6-6-05 Aoba, Sendai, Miyagi 98908579, Japan
[2] Tohoku Univ, Dept Math & Comp Sci, Grad Sch Informat Sci, Aoba Ku, Sendai, Miyagi 98908579, Japan
[3] Res Ctr Informat Secur, Adv Ind Sci & Technol, Chiyoda ku, Tokyo 1010021, Japan
来源
2010 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (EMC 2010) | 2010年
关键词
D O I
10.1109/ISEMC.2010.5711255
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Two types of miniature shielded-loop type magnetic probes were used to analyze RF magnetic near field on the ISO/IEC 18033-3 Standard Cryptographic LSI made by 0.13 mu m CMOS process with clock frequency of 24 MHz. The 180 x 180 mu m(2)-size on-chip shielded loop probe we developed was applied to scan the magnetic near field on the LSI and clarified that the magnetic filed is strong not only on the targeting cryptographic circuit. Such a detailed map was depicted for the first time for cryptographic LSI. Then the differential electromagnetic analysis (DEMA) was performed with the shielded-loop probe (1000 x 500 mu m(2), CP-2S, NEC). All the BITEs of 16-BYTEs long secret key are decrypted by using only 1x10(4) waveform data in case the waveform is measured closely to the cryptographic circuit whereas the error rate does not converge to zero until the waveform number reaches 3x10(4) if the data were extracted far away from the circuit. As the countermeasure against DEMA, 25 mu m thick magnetic film (mu r = 50 at 1MHz, NEC Tokin Co, type E25) was attached on top of bare LSI chip to suppress magnetic field intensity by 6 dB, which can be a good candidate to protect cryptographic LSI from side channel attack.
引用
收藏
页码:103 / 108
页数:6
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