DPA using phase-based waveform matching against random-delay countermeasure

Sei Nagashima, Naofumi Homma, Yuichi Imai, Takafumi Aoki, Akashi Satoh

Research output: Contribution to journalConference articlepeer-review

25 Citations (Scopus)


We propose Differential Power Analysis (DPA) with a phase-based waveform matching technique. Conventionally, a trigger signal and a system clock are used to capture the waveform traces, but the signals always contain jitter-related deviations, and this degrades the accuracy of the statistical analysis. Our method can adjust for this timing deviation with a higher resolution than the sampling rate by post-processing on the measured waveforms. Therefore, no modification of the measuring equipment is required. Our method can also defeat DPA countermeasures creating distorted waveforms with random delays or dummy cycles. We implemented Data Encryption Standard (DES) software with and without the countermeasure on a Z80 microprocessor, and demonstrated the advantages of our method in comparison with a conventional attack.

Original languageEnglish
Article number4253011
Pages (from-to)1807-1810
Number of pages4
JournalProceedings - IEEE International Symposium on Circuits and Systems
Publication statusPublished - 2007
Event2007 IEEE International Symposium on Circuits and Systems, ISCAS 2007 - New Orleans, LA, United States
Duration: 2007 May 272007 May 30

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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