带有半可信第三方的新的合同签署协议

New Contract Signing Protocol with Semi-Trusted Third Party

在公平交换中可验证加密是最重要的基础之一,文中提出一种新的盲解密的可验证加密方案,并在此基础上设计了使用半可信第三方的合同签署协议,此协议尤其是一对多的协议是在交换拓扑不确定情况下的协议,协议中的交换关系对外是保密的,从而解决了Franklin提出的一个公开问题,具有更切合实际、更安全实用等优点,同时这也是首次提出带半可信第三方的多方合同签署协议。

Verifiable encryption plays an important role in fair exchange. A new verifiable encryption with blind decryption scheme is given in the paper. Based on the scheme, this paper presents new contract signing protocols with semi-trusted third party. It also outlines a one-to-many version. The protocol is practical and solves an open problem presented by Franklin. It is the first multi-party contract signing protocols with semi-trusted third party.