Side-channel analysis of Chacha20 implemented in software

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21240%2F25%3A00386089" target="_blank" >RIV/68407700:21240/25:00386089 - isvavai.cz</a>
Result on the web
<a href="https://ieeexplore.ieee.org/document/11272791" target="_blank" >https://ieeexplore.ieee.org/document/11272791</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1109/DSD67783.2025.00036" target="_blank" >10.1109/DSD67783.2025.00036</a>

Result language
angličtina
Original language name
Side-channel analysis of Chacha20 implemented in software
Original language description
This paper investigates the side-channel resistance of the ChaCha20 stream cipher on 8-bit and 32-bit microcontrollers. Using the low-cost ChipWhisperer platform, we demonstrate full keystream recovery under nonce reuse via Correlation Power Analysis (CPA). For proper nonce usage, we propose a novel two-phase CPA strategy that successfully recovers key bytes in the first column of the cipher’s internal state by exploiting second-round leakage. While full key recovery remains out of reach, the results confirm exploitable leakage and highlight practical risks in ChaCha20 implementations on embedded systems.
Czech name
—
Czech description
—

Project
<a href="/en/project/VJ02010010" target="_blank" >VJ02010010: Tools for AI-enhanced Security Verification of Cryptographic Devices</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Proceedings of the 2025 28th Euromicro Conference on Digital System Design
ISBN
979-8-3315-8499-3
ISSN
2639-3859
e-ISSN
2771-2508
Number of pages
8
Pages from-to
183-190
Publisher name
IEEE Computer Society
Place of publication
Los Alamitos
Event location
Salerno
Event date
Sep 10, 2025
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
001717790400024

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