eprintid: 10153741
rev_number: 9
eprint_status: archive
userid: 699
dir: disk0/10/15/37/41
datestamp: 2023-02-28 16:29:51
lastmod: 2023-02-28 16:37:06
status_changed: 2023-02-28 16:29:51
type: report
metadata_visibility: show
sword_depositor: 699
creators_name: Abadi, Aydin
creators_name: Murdoch, steven
creators_name: Zacharias, Thomas
title: Recurring Contingent Payment for Proofs of Retrievability
ispublished: pub
divisions: C05
divisions: F48
divisions: B04
divisions: UCL
keywords: Cryptographic protocol, blockchain, smart contracts, fair exchange
note: This work is licensed under an Attribution 4.0 International License (CC BY 4.0).
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 a “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.
date: 2021-09-10
date_type: published
publisher: Cryptology ePrint Archive
official_url: https://eprint.iacr.org/2021/1145
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 1970127
confidential: false
lyricists_name: Abadi, Aydin
lyricists_id: AKHEI13
actors_name: Abadi, Aydin
actors_id: AKHEI13
actors_role: owner
full_text_status: public
series: Paper 2021/1145
pages: 50
citation:        Abadi, Aydin;  Murdoch, steven;  Zacharias, Thomas;         (2021)    Recurring Contingent Payment for Proofs of Retrievability.                    (Paper 2021/1145   ). Cryptology ePrint Archive       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10153741/1/2021-1145.pdf