@inproceedings{22d6af2ab21145df9b920641a27edde5,
title = "On masked galois-field multiplication for authenticated encryption resistant to side channel analysis",
abstract = "This paper presents a side-channel attack on masked Galois-field (GF) multiplication used in authenticated encryptions including AES-GCM and a new countermeasure against the proposed attack. While the previous side-channel attack is likely to recover the full key of GHASH in AES-GCM, no countermeasure has been discussed and evaluated until now. In this paper, we first apply a straightforward masking countermeasure to GF multiplication for GHASH and show that the masked GF multiplication is resistant to the previous attack. We then show the straightforward masked GHASH can be defeated by a new attack utilizing the variance of power trace. The feasibility of the new attack is demonstrated by an experiment with power traces measured from a smart card operating the masked GHASH. Finally, we propose a new masking countermeasure against the proposed attack.",
keywords = "AES-GCM, Authenticated encryption, Galois-field multiplication, Masking, Side-channel attack",
author = "Hirokazu Oshida and Rei Ueno and Naofumi Homma and Takafumi Aoki",
note = "Funding Information: Acknowledgment. We would like to show our greatest appreciation to Dr. S. Bel{\"a}ıd, and Dr. B. G{\'e}rard for their valuable and insightful comments. This work has been supported by JSPS KAKENHI Grants No. 17H00729. Publisher Copyright: {\textcopyright} 2018, Springer International Publishing AG, part of Springer Nature.; 9th International Workshop on Constructive Side-Channel Analysis and Secure Design, COSADE 2018 ; Conference date: 23-04-2018 Through 24-04-2018",
year = "2018",
doi = "10.1007/978-3-319-89641-0_3",
language = "English",
isbn = "9783319896403",
series = "Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)",
publisher = "Springer Verlag",
pages = "44--57",
editor = "Junfeng Fan and Benedikt Gierlichs",
booktitle = "Constructive Side-Channel Analysis and Secure Design - 9th International Workshop, COSADE 2018, Proceedings",
address = "Germany",
}