Paper 2014/692
Extending Oblivious Transfer Efficiently, or - How to get active security with constant cryptographic overhead
Enrique Larraia
Abstract
On top of the passively secure extension protocol of [IKNP03] we build a new construction secure against active adversaries. We can replace the invocation of the hash function that is used to check the receiver is well-behaved with the XOR of bit strings. This is possible by applying a cut-and-choose technique on the length of the bit strings that the receiver sends in the reversed OT. We also improve on the number of seeds required for the extension, both asymptotically and practically. Moreover, the protocol used to test receiver's behaviour enjoys unconditional security.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- Published elsewhere. Latincrypt 2014
- Keywords
- Oblivious TransferExtension
- Contact author(s)
- cseldv @ bristol ac uk
- History
- 2014-09-04: received
- Short URL
- https://ia.cr/2014/692
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2014/692,
author = {Enrique Larraia},
title = {Extending Oblivious Transfer Efficiently, or - How to get active security with constant cryptographic overhead},
howpublished = {Cryptology {ePrint} Archive, Paper 2014/692},
year = {2014},
url = {https://eprint.iacr.org/2014/692}
}
