International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Moses Liskov

Publications

Year
Venue
Title
2011
JOFC
2010
TCC
2008
PKC
2007
ASIACRYPT
2007
EPRINT
On Tweaking Luby-Rackoff Blockciphers
Tweakable blockciphers, first formalized by Liskov, Rivest, and Wagner, are blockciphers with an additional input, the tweak, which allows for variability. An open problem proposed by Liskov et al. is how to construct tweakable blockciphers without using a pre-existing blockcipher. This problem has yet to receive any significant study. There are many natural questions in this area: is it significantly more effcient to incorporate a tweak directly? How do direct constructions compare to existing techniques? Are these direct constructions optimal and for what levels of security? How large of a tweak can be securely added? In this work, we address these questions for Luby-Rackoff blockciphers. We show that tweakable blockciphers can be created directly from Feistel ciphers, and in some cases show that direct constructions of tweakable blockciphers are more e±cient than previously known constructions.
2005
ASIACRYPT
2005
EPRINT
Using Probabilistic I/O Automata to Analyze an Oblivious Transfer Protocol
The Probabilistic I/O Automata framework of Lynch, Segala and Vaandrager provides tools for precisely specifying protocols and reasoning about their correctness using multiple levels of abstraction, based on implementation relationships between these levels. We enhance this framework to allow analyzing protocols that use cryptographic primitives. This requires resolving and reconciling issues such as nondeterministic behavior and scheduling, randomness, resource-bounded computation, and computational hardness assumptions. The enhanced framework allows for more rigorous and systematic analysis of cryptographic protocols. To demonstrate the use of this framework, we present an example analysis that we have done for an Oblivious Transfer protocol.
2003
CRYPTO
2002
CRYPTO
2001
ASIACRYPT
1999
CHES