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• W4385412498 abstract "Fair exchange protocols let two mutually distrustful parties exchange digital data in a way that neither party can cheat. They have various applications such as the exchange of digital items, or the exchange of digital coins and digital services between a buyer/client and seller/server.In this work, we formally define and propose a generic blockchain-based construction called Recurring Contingent Service Payment (RC-S-P). It (i) lets a fair exchange of digital coins and verifiable service reoccur securely between clients and a server while ensuring that the server is paid if and only if it delivers a valid service, and (ii) ensures the parties’ privacy is preserved. RC-S-P supports arbitrary verifiable services, such as Proofs of Retrievability (PoR) or verifiable computation and imposes low on-chain over-heads. Our formal treatment and construction, for the first time, consider the setting where either client or server is malicious.We also present a concrete efficient instantiation of RC-S-P when the verifiable service is PoR. We implemented the concrete instantiation and analysed its cost. When it deals with a 4-GB outsourced file, a verifier can check a proof in only 90 milliseconds, and a dispute between a prover and verifier is resolved in 0.1 milliseconds.At CCS 2017, two blockchain-based protocols were proposed to support the fair exchange of digital coins and a certain verifiable service; namely, PoR. In this work, we show that these protocols (i) are susceptible to a free-riding attack which enables a client to receive the service without paying the server, and (ii) are not suitable for cases where parties’ privacy matters, e.g., when the server’s proof status or buyer’s file size must remain private from the public. RC-S-P simultaneously mitigates the above attack and preserves the parties’ privacy." @default.
• W4385412498 created "2023-08-01" @default.
• W4385412498 creator A5011443512 @default.
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• W4385412498 date "2023-07-01" @default.
• W4385412498 modified "2023-09-26" @default.
• W4385412498 title "Recurring Contingent Service Payment" @default.
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• W4385412498 doi "https://doi.org/10.1109/eurosp57164.2023.00049" @default.
• W4385412498 hasPublicationYear "2023" @default.
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