International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Kazumaro Aoki

Publications

Year
Venue
Title
2018
CRYPTO
Fast Correlation Attack Revisited 📺
A fast correlation attack (FCA) is a well-known cryptanalysis technique for LFSR-based stream ciphers. The correlation between the initial state of an LFSR and corresponding key stream is exploited, and the goal is to recover the initial state of the LFSR. In this paper, we revisit the FCA from a new point of view based on a finite field, and it brings a new property for the FCA when there are multiple linear approximations. Moreover, we propose a novel algorithm based on the new property, which enables us to reduce both time and data complexities. We finally apply this technique to the Grain family, which is a well-analyzed class of stream ciphers. There are three stream ciphers, Grain-128a, Grain-128, and Grain-v1 in the Grain family, and Grain-v1 is in the eSTREAM portfolio and Grain-128a is standardized by ISO/IEC. As a result, we break them all, and especially for Grain-128a, the cryptanalysis on its full version is reported for the first time.
2010
CRYPTO
2009
ASIACRYPT
2009
EUROCRYPT
2009
CRYPTO
2008
ASIACRYPT
2007
ASIACRYPT
2006
CHES
2004
ASIACRYPT
1997
FSE
1995
CRYPTO
1994
CRYPTO

Program Committees

FSE 2015
FSE 2014
FSE 2013
Asiacrypt 2011
FSE 2006
FSE 2005