支持多中心聚合签名的实用性拜占庭容错改进方案

为了解决区块链共识机制中验证效率偏低问题，将聚合签名方法应用于共识过程中的消息验证，改变共识过程中传统的单签名验证方式，从而降低共识过程中的验证复杂性;为了解决密钥中心权限过大问题，结合分布式密钥生成技术实现多中心的密钥授权机制，使共识节点的密钥生成不再依赖于单可信中心，从而避免密钥托管问题;以实用性拜占庭容错方案为例，构造基于多中心聚合签名的拜占庭容错共识改进方案。仿真实验表明，相对传统的实用性拜占庭容错方案，所提方案效率更高。

Improved scheme of practical Byzantine fault tolerance based on multi-authority aggregated signature

To solve the problem of low verification efficiency in the blockchain consensus mechanism, this work applies the aggregated signature method to the message verification in the consensus process, which changes the traditional single signature verification method in the consensus process and thus reduces the verification complexity. In addition, to solve the problem of excessive authority of the key authority, this work further combines distributed key generation to realize a multi-authority key authorization mechanism, so that the key generation of the consensus node no longer depends on a single trusted center, thus avoiding the secret key escrow problem. Taking the practical Byzantine fault tolerant (PBFT) consensus mechanism as an example, this work constructs an improved Byzantine fault-tolerant consensus scheme based on multi-authority aggregated signature. The simulation experiment shows that the proposed scheme is more efficient than the traditional PBFT scheme.