TY - GEN
T1 - AuxChannel
T2 - 17th ACM ASIA Conference on Computer and Communications Security 2022, ASIA CCS 2022
AU - Sui, Zhimei
AU - Liu, Joseph K.
AU - Yu, Jiangshan
AU - Au, Man Ho
AU - Liu, Jia
N1 - Funding Information:
This work was partially supported by the Australian Research Council (ARC) under project DE210100019 and project DP220101234.
Publisher Copyright:
© 2022 ACM.
PY - 2022/5/30
Y1 - 2022/5/30
N2 - Payment channels have been a promising solution to blockchain scalability. While payment channels for script-empowered blockchains (such as Bitcoin and Ethereum) have been well studied, developing payment channels for scriptless blockchains (such as Monero) is considered challenging. In particular, nabling bidirectional payment on scriptless blockchains remains an open challenge. This work closes this gap by providing AuxChannel, the first bi-directional payment channel protocol for scriptless blockchains, meaning that building payment channels only requires the support of verifiably encrypted signature (aka adaptor signature) on the underlying blockchain. AuxChannel leverages verifiably encrypted signature to create a commitment for each off-chain payment and deploys a verifiable decentralised key escrow service to resolve dispute. To enable efficient construction of AuxChannel, we introduce a new cryptographic primitive, named Consecutive Verifiably Encrypted Signature (CVES), as a core building block and it can also be of independent interest for other applications. We provide and implement a provably secure instantiation on Schnorr-based CVES. We also provide a formal security analysis on the security of the AuxChannel.
AB - Payment channels have been a promising solution to blockchain scalability. While payment channels for script-empowered blockchains (such as Bitcoin and Ethereum) have been well studied, developing payment channels for scriptless blockchains (such as Monero) is considered challenging. In particular, nabling bidirectional payment on scriptless blockchains remains an open challenge. This work closes this gap by providing AuxChannel, the first bi-directional payment channel protocol for scriptless blockchains, meaning that building payment channels only requires the support of verifiably encrypted signature (aka adaptor signature) on the underlying blockchain. AuxChannel leverages verifiably encrypted signature to create a commitment for each off-chain payment and deploys a verifiable decentralised key escrow service to resolve dispute. To enable efficient construction of AuxChannel, we introduce a new cryptographic primitive, named Consecutive Verifiably Encrypted Signature (CVES), as a core building block and it can also be of independent interest for other applications. We provide and implement a provably secure instantiation on Schnorr-based CVES. We also provide a formal security analysis on the security of the AuxChannel.
KW - payment channel
KW - scalability
KW - scriptless blockchain
UR - http://www.scopus.com/inward/record.url?scp=85133202814&partnerID=8YFLogxK
U2 - 10.1145/3488932.3524126
DO - 10.1145/3488932.3524126
M3 - Conference article published in proceeding or book
AN - SCOPUS:85133202814
T3 - ASIA CCS 2022 - Proceedings of the 2022 ACM Asia Conference on Computer and Communications Security
SP - 138
EP - 152
BT - ASIA CCS 2022 - Proceedings of the 2022 ACM Asia Conference on Computer and Communications Security
PB - Association for Computing Machinery, Inc
Y2 - 30 May 2022 through 3 June 2022
ER -