Paper 2023/1096
White-Box Block Cipher Implementation Based on LS-Design
Abstract
Protecting secret keys from malicious observers in untrusted environments is a critical security issue. White-box cryptography suggests software protection by hiding the key in the white-box setting. One method for hiding the key in the cipher code is through encoding methods. Unfortunately, encoding methods may be vulnerable to algebraic attacks and side-channel analysis. Another technique to hide the key is (M,Z)-space hardness approach that conceals the key into a large lookup table generated with a reliable small block cipher. In (M,Z)-space-hard algorithms, the key extraction problem in the white-box setting turns into a key recovery problem in the black-box setting. One of the problems for (M,Z)-space-hard algorithms is improving run-time performance. In this study, we aim to improve the run-time performance of the existing white-box implementations. We propose an LS-design based white-box algorithm with better run-rime performance than space-hard SPNbox algorithm. Moreover, an LS-design based table creation method is designed. When we compare the run-time performance of our method with the SPNbox algorithm, we obtain 28% improvement for white-box implementation and 27% for black-box implementation for 128-bit block size. The LS-design based method is also used for 256-bit block size in the white-box setting.
Metadata
- Available format(s)
-
PDF
- Category
- Applications
- Publication info
- Preprint.
- Keywords
- White-box cryptographySpace-hard ciphersSoftware protectionLS-designEfficiency
- Contact author(s)
-
hatice kubra 89 @ gmail com
ceyda mangir @ alumni metu edu tr
oguz @ metu edu tr - History
- 2023-08-08: revised
- 2023-07-14: received
- See all versions
- Short URL
- https://ia.cr/2023/1096
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2023/1096,
author = {Hatice Kübra Güner and Ceyda Mangır and Oğuz Yayla},
title = {White-Box Block Cipher Implementation Based on LS-Design},
howpublished = {Cryptology ePrint Archive, Paper 2023/1096},
year = {2023},
note = {\url{https://eprint.iacr.org/2023/1096}},
url = {https://eprint.iacr.org/2023/1096}
}
