Multi-party Contract Signing Protocol Based on Certificateless
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摘要: 线上合同签署在电子商务中日益普及，在互不信任的签署方之间签署一份合同并不是一件简单的事情，各方就合同签署问题提出过许多合同签署协议。其中较多的协议是带有第三方参与的，但是在效率方面并不占优势，且易出现安全问题。现有借助区块链技术取代第三方参与的合同签署协议中，区块链的公开验证对不管是签署方还是待签署合同的敏感信息又发起了挑战。且大多协议针对于双方合同签署，随着签署方数量的增加，协议的通信成本和复杂度都在急剧增加。该文结合现有协议，提出一个高效的多方合同签署协议，协议中通过基于无证书的高效聚合签名方案，用于提高区块链下签署方签名验证效率，在区块链上仅公开签署方的临时密钥以减少系统开销。该协议满足正确性、安全性、公平性、私密性以及高效性。Abstract: Online contract signing is becoming more and more popular in e-commerce. It is not easy to sign a contract between two parties who do not trust each other. Many of these protocols involve the participation of third parties, but they are not advantageous in efficiency and prone to security problems. Currently, contract signing agreements with third-party participation are replaced by block chain technology, but the public verification of block chain challenges the sensitive information of both the signer and the contract to be signed. And most of the agreements are for the signing of contracts between the two parties. With the increase of the number of signatories, the communication cost and complexity of the agreements increase sharply. Combined with the existing protocols, this paper proposes an efficient multi-party contract signing protocol. In the protocol, an efficient aggregation signature scheme based on no certificate is used to improve the signature verification efficiency of the signer under the block chain, and only the temporary key of the signer is disclosed on the block chain to reduce the system overhead. The protocol satisfies the requirements of correctness, security, fairness, privacy and high efficiency.
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Key words:
- Aggregation verifiable signature /
- Privacy protection /
- Blockchain /
- Contract signing
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