TY - GEN

T1 - Analysis on equivalent current source of AES-128 circuit for HD power model verification

AU - Iokibe, Kengo

AU - Maeshima, Kazuhiro

AU - Kagotani, Hiroto

AU - Nogami, Yasuyuki

AU - Toyota, Yoshitaka

AU - Watanabe, Tetsushi

PY - 2014/12/23

Y1 - 2014/12/23

N2 - We analyzed equivalent current source of cryptographic circuits implemented on a field programmable gate array (FPGA). The equivalent current source represented internal switching current behaviors in the cryptographic circuits during an Advanced Encryption Standard (AES) operation. In this work, the internal current was analyzed for extracting leakage functions and correlation coefficients from scatter diagrams of the Hamming Distance (HD) of AES intermediate values and the current magnitudes. The obtained leakage functions were confirmed a well-known assumption on the HD power model that magnitude of switching current due to transition of register states is proportional to HD of the register. The internal current was also investigated in terms of correlation with the HD model. Correlation coefficients increased as transforming the external power trace in the internal current because two types of noise were reduced by the transform; constant noise and overlap effect of successive rounds. The noise reduction inferred that the use of the internal current source would provide more precise verification of countermeasures.

AB - We analyzed equivalent current source of cryptographic circuits implemented on a field programmable gate array (FPGA). The equivalent current source represented internal switching current behaviors in the cryptographic circuits during an Advanced Encryption Standard (AES) operation. In this work, the internal current was analyzed for extracting leakage functions and correlation coefficients from scatter diagrams of the Hamming Distance (HD) of AES intermediate values and the current magnitudes. The obtained leakage functions were confirmed a well-known assumption on the HD power model that magnitude of switching current due to transition of register states is proportional to HD of the register. The internal current was also investigated in terms of correlation with the HD model. Correlation coefficients increased as transforming the external power trace in the internal current because two types of noise were reduced by the transform; constant noise and overlap effect of successive rounds. The noise reduction inferred that the use of the internal current source would provide more precise verification of countermeasures.

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M3 - Conference contribution

AN - SCOPUS:84942583716

T3 - IEEE International Symposium on Electromagnetic Compatibility

SP - 302

EP - 305

BT - EMC 2014/Tokyo - 2014 International Symposium on Electromagnetic CompatibiIity, Proceedings

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 2014 International Symposium on Electromagnetic CompatibiIity, EMC 2014

Y2 - 12 May 2014 through 16 May 2014

ER -