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

Kengo Iokibe, Kazuhiro Maeshima, Hiroto Kagotani, Yasuyuki Nogami, Yoshitaka Toyota, Tetsushi Watanabe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


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 languageEnglish
Title of host publicationEMC 2014/Tokyo - 2014 International Symposium on Electromagnetic CompatibiIity, Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)9784885522871
Publication statusPublished - Dec 23 2014
Event2014 International Symposium on Electromagnetic CompatibiIity, EMC 2014 - Tokyo, Japan
Duration: May 12 2014May 16 2014

Publication series

NameIEEE International Symposium on Electromagnetic Compatibility
ISSN (Print)1077-4076
ISSN (Electronic)2158-1118


Other2014 International Symposium on Electromagnetic CompatibiIity, EMC 2014

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Analysis on equivalent current source of AES-128 circuit for HD power model verification'. Together they form a unique fingerprint.

Cite this