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학술지 On the Linear Transformation in White-Box Cryptography
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저자
이승광, 조남수, 김명철
발행일
202003
출처
IEEE Access, v.8, pp.51684-51691
ISSN
2169-3536
출판사
IEEE
DOI
https://dx.doi.org/10.1109/ACCESS.2020.2980594
협약과제
20HR3100, 고신뢰 지능정보 서비스에서 휴먼(H)-인프라(I)-서비스(S)를 연결하는 Portal Device 보안 기술 개발, 조상래
초록
A linear transformation is applied to the white-box cryptographic implementation for the diffusion effect to prevent key-dependent intermediate values from being analyzed. However, it has been shown that there still exists a correlation before and after the linear transformation, and thus this is not enough to protect the key against statistical analysis. So far, the Hamming weight of rows in the invertible matrix has been considered the main cause of the key leakage from the linear transformation. In this study, we present an in-depth analysis of the distribution of intermediate values and the characteristics of block invertible binary matrices. Our mathematical analysis and experimental results show that the balanced distribution of the key-dependent intermediate value is the main cause of the key leakage.
KSP 제안 키워드
Balanced distribution, Diffusion effect, Hamming weight, In-depth analysis, Intermediate values, Invertible matrix, Key leakage, Key-dependent, Linear transformation, Statistical Analysis, Whitebox Cryptography(WBC)
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