International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Michael Hutter

Affiliation: Rambus Cryptography Research

Publications

Year
Venue
Title
2017
CHES
A Side-Channel Assisted Cryptanalytic Attack Against QcBits
QcBits is a code-based public key algorithm based on a problem thought to be resistant to quantum computer attacks. It is a constant-time implementation for a quasi-cyclic moderate density parity check (QC-MDPC) Niederreiter encryption scheme, and has excellent performance and small key sizes. In this paper, we present a key recovery attack against QcBits. We first used differential power analysis (DPA) against the syndrome computation of the decoding algorithm to recover partial information about one half of the private key. We then used the recovered information to set up a system of noisy binary linear equations. Solving this system of equations gave us the entire key. Finally, we propose a simple but effective countermeasure against the power analysis used during the syndrome calculation.
2015
EPRINT
2015
CHES
2014
EPRINT
2014
EPRINT
2013
CHES
2013
CHES
2011
CHES
2008
CHES
2007
CHES

Program Committees

CHES 2016
CHES 2015
CHES 2014