Paper 2014/692 Original: eprint.iacr.org/2014/692 ↗
Extending Oblivious Transfer Efficiently, or - How to get active security with constant cryptographic overhead
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
- Preprint.
- History
- 2014-09-04: last updated
- 2014-09-04: published
- Short URL
- https://ia.cr/2014/692
- License
- https://creativecommons.org/licenses/by/4.0/
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}
}