Generic Construction of
Privacy-Preserving Optimistic Fair Exchange Protocol South China Agricultural University,
Guangzhou 510642, China qhuang @ scau.edu.cn
Abstract Privacy-preserving optimistic fair exchange (P2OFE)
is a kind of protocols which aim to solve the fairness problem in the
exchange of digital signatures between two parties and in the meanwhile
protect their privacy. In P2OFE, no one else including the
semi-trusted third party in charge of arbitration can confirm an exchange
even after resolving a dispute. In this paper we present a black-box
construction of P2OFE based on a tag-based public key encryption
scheme and a standard digital signature scheme. Our construction follows the
‘sign-then-encrypt’ paradigm, and is secure in the standard model. Our
construction is generic and admits more instantiations of P2OFE. Keywords: fair exchange, digital
signature, privacy preserving, tag-based encryption +: Corresponding author: Qiong
Huang, qhuang@scau.edu.cn, 483Wushan Road, Tianhe
District, Guangzhou 510642, P.R., Tel: +86-20-85285393 |