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Title:
A Side-Channel Attack on a Hardware Implementation of CRYSTALS-Kyber
Authors: Yanning Ji, Ruize Wang, Kalle Ngo, Elena Dubrova, Linus Backlund
Abstract:CRYSTALS-Kyber has been recently selected by the NIST as a new public-key encryption and key-establishment algorithm to be standardized. This makes it important to assess how well CRYSTALS-Kyber implementations withstand side-channel attacks. Software implementations of CRYSTALS-Kyber have been already analyzed and the discovered vulnerabilities were patched in the subsequently released versions. In this paper, we present a profiling side-channel attack on a hardware implementation of CRYSTALS-Kyber with the security parameter k = 3, Kyber768. Since hardware implementations carry out computation in parallel, they are typically more difficult to break than their software counterparts. We demonstrate a successful message (session key) recovery by deep learning-based power analysis. Our results indicate that currently available hardware implementations of CRYSTALS-Kyber need better protection against side-channel attacks.
ePrint: https://eprint.iacr.org/2022/1452
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