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| Presentation | 2022-03-08 14:55 Evaluation of Side-channel Leaks Specific to Unrolled AES Hardware Ayano Nakashima, Rei Ueno, Naofumi Homma (Tohoku Univ.)  VLD2021-100 HWS2021-77 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | This paper presents the evaluation of a unique side-channel leakage occurred from the middle rounds of (pipelined) unrolled AES hardware. A full-round countermeasure is ideal for an unrolled implementation of block ciphers. However, for reducing the large hardware overhead, only the vulnerable rounds should be protected. Generally, the first and last rounds are vulnerable to side-channel attacks, and should be protected . In addition, recently the first few rounds could also be attacked with the same amount of computation as the first round. This is because the side channel leakage depending on the result of the first round occurs from the following rounds where the input diffusion is not sufficient. This leakage is unique to unrolled implementation. In this paper we evaluate the presence or absence of such a unique leakage from the middle rounds of unrolled AES hardware by CPA. In particular, we propose a new power model to estimate the middle round leakage more accurately from the AES first round intermediate values. The conventional model employs the Hamming Distance (HD) value corresponding to the amount of the first round switching in order to perform CPAs with the middle round power consumption. But we found that this was not applicable to the diffusion characteristics of AES. The proposed model classifies the intermediate values directly by the difference value by an XOR operation in stead of the HD value, and considers the estimated power value as the HD value given by the key-averaged pre-computation. We demonstrate through CPAs with the proposed model that a unique side-channel leakage occurs even from the first several rounds of unrolled AES hardware. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Side-channel attacks / Block cipher / Unrolled implementation / AES / Differential power analysis / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 121, no. 413, HWS2021-77, pp. 135-140, March 2022. | |
| Paper # | HWS2021-77 | |
| Date of Issue | 2022-02-28 (VLD, HWS) | |
| ISSN | Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | VLD2021-100 HWS2021-77 |
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| Conference Information | |
| Committee | VLD HWS |
| Conference Date | 2022-03-07 - 2022-03-08 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Design Technology for System-on-Silicon, Hardware Security, etc. |
| Paper Information | |
| Registration To | HWS |
| Conference Code | 2022-03-VLD-HWS |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Evaluation of Side-channel Leaks Specific to Unrolled AES Hardware |
| Sub Title (in English) | |
| Keyword(1) | Side-channel attacks |
| Keyword(2) | Block cipher |
| Keyword(3) | Unrolled implementation |
| Keyword(4) | AES |
| Keyword(5) | Differential power analysis |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Ayano Nakashima |
| 1st Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 2nd Author's Name | Rei Ueno |
| 2nd Author's Affiliation | Tohoku University (Tohoku Univ.) |
| 3rd Author's Name | Naofumi Homma |
| 3rd Author's Affiliation | Tohoku University (Tohoku Univ.) |
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| Speaker | Author-1 |
| Date Time | 2022-03-08 14:55:00 |
| Presentation Time | 25 minutes |
| Registration for | HWS |
| Paper # | VLD2021-100, HWS2021-77 |
| Volume (vol) | vol.121 |
| Number (no) | no.412(VLD), no.413(HWS) |
| Page | pp.135-140 |
| #Pages | 6 |
| Date of Issue | 2022-02-28 (VLD, HWS) |
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