A High-Resolution Phase-Based Waveform Matching and Its Application to Side-Channel Attacks

Naofumi HOMMA  Sei NAGASHIMA  Takeshi SUGAWARA  Takafumi AOKI  Akashi SATOH  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E91-A   No.1   pp.193-202
Publication Date: 2008/01/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e91-a.1.193
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Side Channel Attacks
Keyword: 
side-channel attacks,  DPA,  DEMA,  cryptographic module,  waveform matching,  phase-only correlation,  

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Summary: 
This paper presents an enhanced side-channel attack using a phase-based waveform matching technique. Conventionally, side-channel attacks such as Simple Power Analysis (SPA) and Differential Power Analysis (DPA) capture signal waveforms (e.g., power traces) with a trigger signal or a system clock, and use a statistical analysis of the waveforms to reduce noise and to retrieve secret information. However, the waveform data often includes displacement errors, and this degrades the accuracy of the statistical analysis. The use of a Phase-Only Correlation (POC) technique makes it possible to estimate the displacements between the signal waveforms with higher resolution than the sampling resolution. The accuracy of side-channel attacks can be enhanced using the POC-based matching method. Also, a popular DPA countermeasure of creating distorted waveforms with random delays can be defeated by our method. In this paper, we demonstrate the advantages of the proposed method in comparison with conventional approaches of experimental DPA and Differential ElectroMagnetic Analysis (DEMA) against DES software and hardware implementations.