International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Arkady Yerukhimovich

Affiliation: MIT Lincoln Laboratory

Publications

Year
Venue
Title
2019
JOFC
(Efficient) Universally Composable Oblivious Transfer Using a Minimal Number of Stateless Tokens
We continue the line of work initiated by Katz (Eurocrypt 2007) on using tamper-proof hardware tokens for universally composable secure computation. As our main result, we show an oblivious-transfer (OT) protocol in which two parties each create and transfer a single, stateless token and can then run an unbounded number of OTs. We also show a more efficient protocol, based only on standard symmetric-key primitives (block ciphers and collision-resistant hash functions), that can be used if a bounded number of OTs suffice. Motivated by this result, we investigate the number of stateless tokens needed for universally composable OT. We prove that our protocol is optimal in this regard for constructions making black-box use of the tokens (in a sense we define). We also show that nonblack-box techniques can be used to obtain a construction using only a single stateless token.
2017
PKC
2014
TCC
2011
TCC
2011
TCC
2011
TCC
2009
ASIACRYPT