Paper 2021/1145
Recurring Contingent Payment for Proofs of Retrievability
Aydin Abadi, Steven J. Murdoch, and Thomas Zacharias
Abstract
Fair exchange protocols let two mutually distrusted parties exchange digital data in a way that neither can cheat. At CCS 2017, Campanelli et al. proposed two blockchain-based protocols for the fair exchange of digital coins and a certain service, i.e., “proofs of retrievability” (PoR), that take place between a buyer and seller. In this work, we identify two serious issues of these schemes; namely, (1) a malicious client can waste the seller’s resources, and (2) real-time leakage of information to non-participants in the exchange. To rectify the issues, we propose “recurring contingent PoR payment” (RC-PoR-P). It lets the fair exchange reoccur while ensuring that the seller’s resources are not wasted, and the parties’ privacy is preserved. We implemented the RC- PoR-P. Our cost analysis indicates that the RC-PoR-P is efficient. The RC-PoR-P is the first of its kind that offers all the above features.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- Preprint. MINOR revision.
- Keywords
- Proofs of RetrievabilityFair ExchangeBlockchainSmart contract
- Contact author(s)
-
aydin abadi @ ucl ac uk
s murdoch @ ucl ac uk
thomas zacharias @ ed ac uk - History
- 2021-09-10: received
- Short URL
- https://ia.cr/2021/1145
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2021/1145,
author = {Aydin Abadi and Steven J. Murdoch and Thomas Zacharias},
title = {Recurring Contingent Payment for Proofs of Retrievability},
howpublished = {Cryptology {ePrint} Archive, Paper 2021/1145},
year = {2021},
url = {https://eprint.iacr.org/2021/1145}
}
