Paper 2015/724
A masked ring-LWE implementation
Oscar Reparaz, Sujoy Sinha Roy, Frederik Vercauteren, and Ingrid Verbauwhede
Abstract
Lattice-based cryptography has been proposed as a postquantum public-key cryptosystem. In this paper, we present a masked ring-LWE decryption implementation resistant to first-order side-channel attacks. Our solution has the peculiarity that the entire computation is performed in the masked domain. This is achieved thanks to a new, bespoke masked decoder implementation. The output of the ring-LWE decryption are Boolean shares suitable for derivation of a symmetric key. We have implemented a hardware architecture of the masked ring-LWE processor on a Virtex-II FPGA, and have performed side channel analysis to confirm the soundness of our approach. The area of the protected architecture is around $2000$ LUTs, a $20\%$ increase with respect to the unprotected architecture. The protected implementation takes $7478$ cycles to compute, which is only a factor $\times2.6$ larger than the unprotected implementation.
Metadata
- Available format(s)
-
PDF
- Category
- Implementation
- Publication info
- A minor revision of an IACR publication in CHES 2015
- Keywords
- post-quantum cryptographylattice-based cryptographyring-LWEmaskingside-channel analysisDPA
- Contact author(s)
- oscar reparaz @ esat kuleuven be
- History
- 2015-07-21: received
- Short URL
- https://ia.cr/2015/724
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2015/724,
author = {Oscar Reparaz and Sujoy Sinha Roy and Frederik Vercauteren and Ingrid Verbauwhede},
title = {A masked ring-{LWE} implementation},
howpublished = {Cryptology {ePrint} Archive, Paper 2015/724},
year = {2015},
url = {https://eprint.iacr.org/2015/724}
}
