HT2REP: A fair cross-chain atomic exchange protocol under UC framework based on HTLCs and TRE
Publication Name
Computer Standards and Interfaces
Abstract
Cross-chain transactions between heterogeneous blockchain systems pose various challenges, encompassing atomicity, security, and fairness of the transactions. While Traditional Hash Time Lock Contracts (HTLCs) can achieve atomic cross-chain transactions, they exhibit fairness deficiencies in two aspects: firstly, the transaction initiator benefits from an American Option (AO) advantage, and secondly, the transaction responder may be incentivized to launch a Draining Attack (DA), both of which impact the fairness of cross-chain transactions. Because of significant fluctuations in the exchange rate of tokens held by both parties, cross-chain transactions often face timeout rollbacks, resulting in a diminished probability of successful transactions. To tackle these issues, we propose a novel atomic cross-chain exchange protocol—HT2REP. This protocol integrates Time Released Encryption (TRE), ShangMi 3 Hash function (SM3), and scalable smart contract technologies to enhance fairness within the traditional HTLCs protocol. Additionally, HT2REP ensures atomicity, security, and a heightened probability of success for cross-chain exchanges. Finally, we demonstrate that HT2REP is Universally Composable (UC) secure.
Open Access Status
This publication is not available as open access
Volume
89
Article Number
103834
Funding Number
2019BDKFJJ009