Paper 2018/1047
On the Linear Transformation in White-box Cryptography
Seungkwang Lee, Nam-su Jho, and Myungchul Kim
Abstract
Linear transformations are 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.
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- Preprint. MINOR revision.
- Keywords
- White-box cryptographylinear transformationkey leakage
- Contact author(s)
- skwang @ etri re kr
- History
- 2020-02-18: last of 10 revisions
- 2018-11-02: received
- See all versions
- Short URL
- https://ia.cr/2018/1047
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2018/1047,
author = {Seungkwang Lee and Nam-su Jho and Myungchul Kim},
title = {On the Linear Transformation in White-box Cryptography},
howpublished = {Cryptology {ePrint} Archive, Paper 2018/1047},
year = {2018},
url = {https://eprint.iacr.org/2018/1047}
}