基于门限签名的时间轮换公证人组模型研究  

Study on Time Rotation Notary Group Model Based on Threshold Signature

作　　者：臧文洋 吕进来 ZANG Wenyang;LYU Jinlai(School of Information and Computer,Taiyuan University of Technology,Jinzhong,Shanxi 030600,China)

机构地区：[1]太原理工大学信息与计算机学院,山西晋中030600

出　　处：《计算机科学》2024年第8期403-411,共9页Computer Science

摘　　要：随着各类区块链系统的不断涌现,跨链交互需求不断增加,跨链桥验证环节的安全性显得愈发重要。公证人机制原理简单、效率较高,常用于跨链交易验证、跨链交易确认等环节。但公证人机制存在去中心化程度低、低签名比例可验证交易、验证节点信息公开等问题。为提高跨链桥验证环节的安全性,提出了一种基于门限签名的时间轮换公证人组模型。该模型中的公证人组由同时拥有源区块链和目标区块链账户的高信用值节点组成。公证人组中的验证节点有任期要求且需质押保证金,公证人组采用门限签名技术对跨链交易进行签名,一半以上的验证节点签名后,跨链交易才能实施;候选公证人组为时间轮换公证人组提供新验证节点。分析结果表明,所提模型去中心化程度高,验证节点恶意攻击率低,验证签名环节安全性高,验证节点私密性高,跨链消息验证效率高。With the emergence of various blockchain systems,the demand for cross-chain interaction is increasing,and the security of cross-chain bridge verification becomes more and more important.The notary schemes have simple principle and high efficiency,and are often used in cross-chain transaction verification,cross-chain transaction confirmation and other processes.How-ever,the notary schemes have some problems,such as low degree of decentralization,verifiable transactions with low signature ratio,and information disclosure of verification nodes.In order to improve the security of cross-chain bridge verification,a time rotation notary group model based on threshold signature is proposed.The notary group in this model is composed of high credibility nodes that have both source and target blockchain accounts.The verification nodes in the notary group have tenure requirements and need to pledge the security deposit.The notary group uses threshold signature technology to sign cross-chain transactions.The cross-chain transaction can only be implemented after more than half of the verification nodes in the notary group sign.The candidate notary group provides some new verification nodes for the time rotation notary group.The analysis results of the time rotation notary group model proves that the proposed model has high degree of decentralization,low malicious attack rate of the verification nodes,high security of the verification signature links,high privacy of the verification nodes,and high efficiency of cross-chain message verification.

关 键 词：区块链 跨链 跨链桥 公证人机制 门限签名 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]