Title

Preserving transparency and accountability in optimistic fair exchange of digital signatures

Publication Type

Journal Article

Publication Date

6-2011

Abstract

Optimistic fair exchange (OFE) protocols are useful tools for two participants to fairly exchange items with the aid of a third party who is only involved if needed. A widely accepted requirement is that the third party's involvement in the exchange must be transparent, to protect privacy and avoid bad publicity. At the same time, a dishonest third party would compromise the fairness of the exchange and the third party thus must be responsible for its behaviors. This is achieved in OFE protocols with another property called accountability. It is unfortunate that the accountability has never been formally studied in OFE since its introduction ten years ago. In this paper, we fill these gaps by giving the first complete definition of accountability in OFE where one of the exchanged items is a digital signature and a generic (also the first) design of OFE where transparency and accountability coexist.

Keywords

Accountability, fair exchange, generic design, transparency

Discipline

Information Security

Research Areas

Information Security and Trust

Publication

IEEE Transactions on Information Forensics and Security

Volume

6

Issue

2

First Page

489

Last Page

512

ISSN

1556-6013

Identifier

10.1109/TIFS.2011.2109952

Publisher

IEEE

Additional URL

http://dx.doi.org/10.1109/TIFS.2011.2109952