International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Chen-Mou Cheng

Publications

Year
Venue
Title
2021
ASIACRYPT
A Systematic Approach and Analysis of Key Mismatch Attacks on Lattice-Based NIST Candidate KEMs 📺
Research on key mismatch attacks against lattice-based KEMs is an important part of the cryptographic assessment of the ongoing NIST standardization of post-quantum cryptography. There have been a number of these attacks to date. However, a unified method to evaluate these KEMs' resilience under key mismatch attacks is still missing. Since the key index of efficiency is the number of queries needed to successfully mount such an attack, in this paper, we propose and develop a systematic approach to find lower bounds on the minimum average number of queries needed for such attacks. Our basic idea is to transform the problem of finding the lower bound of queries into finding an optimal binary recovery tree (BRT), where the computations of the lower bounds become essentially the computations of a certain Shannon entropy. The optimal BRT approach also enables us to understand why, for some lattice-based NIST candidate KEMs, there is a big gap between the theoretical bounds and bounds observed in practical attacks, in terms of the number of queries needed. This further leads us to propose a generic improvement method for these existing attacks, which are confirmed by our experiments. Moreover, our proposed method could be directly used to improve the side-channel attacks against CCA-secure NIST candidate KEMs.
2013
ASIACRYPT
2012
CHES
2011
CHES
2010
CHES
2009
CHES
2009
EUROCRYPT

Program Committees

Asiacrypt 2020
CHES 2020
Asiacrypt 2019
CHES 2018
CHES 2016
Asiacrypt 2016
Eurocrypt 2015
CHES 2015
Asiacrypt 2015
Asiacrypt 2014
CHES 2011