### Abstract

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.

Original language | English |
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Title of host publication | IEEE International Symposium on Electromagnetic Compatibility |

Publisher | Institute of Electrical and Electronics Engineers Inc. |

Pages | 302-305 |

Number of pages | 4 |

Volume | 2014-December |

ISBN (Print) | 9784885522871 |

Publication status | Published - Dec 23 2014 |

Event | 2014 International Symposium on Electromagnetic CompatibiIity, EMC 2014 - Tokyo, Japan Duration: May 12 2014 → May 16 2014 |

### Other

Other | 2014 International Symposium on Electromagnetic CompatibiIity, EMC 2014 |
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Country | Japan |

City | Tokyo |

Period | 5/12/14 → 5/16/14 |

### Fingerprint

### ASJC Scopus subject areas

- Electrical and Electronic Engineering
- Condensed Matter Physics

### Cite this

*IEEE International Symposium on Electromagnetic Compatibility*(Vol. 2014-December, pp. 302-305). [6997165] Institute of Electrical and Electronics Engineers Inc..

**Analysis on equivalent current source of AES-128 circuit for HD power model verification.** / Iokibe, Kengo; Maeshima, Kazuhiro; Kagotani, Hiroto; Nogami, Yasuyuki; Toyota, Yoshitaka; Watanabe, Tetsushi.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*IEEE International Symposium on Electromagnetic Compatibility.*vol. 2014-December, 6997165, Institute of Electrical and Electronics Engineers Inc., pp. 302-305, 2014 International Symposium on Electromagnetic CompatibiIity, EMC 2014, Tokyo, Japan, 5/12/14.

}

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.

UR - http://www.scopus.com/inward/record.url?scp=84942583716&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84942583716&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84942583716

SN - 9784885522871

VL - 2014-December

SP - 302

EP - 305

BT - IEEE International Symposium on Electromagnetic Compatibility

PB - Institute of Electrical and Electronics Engineers Inc.

ER -