Volume 7 - Issue 2
Generic Construction of Privacy-Preserving Optimistic Fair Exchange Protocols
- Qingwen Guo
South China Agricultural University, Guangzhou 510642, China
guoqingwen@stu.scau.edu.cn
- Yuzhao Cui
South China Agricultural University, Guangzhou 510642, China
yuzhaoc@stu.scau.edu.cn
- Xiaomeng Zou
South China Agricultural University, Guangzhou 510642, China
zzxiaomengj@stu.scau.edu.cn
- Qiong Huang
South China Agricultural University, Guangzhou 510642, China
qhuang@scau.edu.cn
Keywords: fair exchange, digital signature, privacy preserving, tag-based encryption
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.