Abstract: The paper proposes a new fair document exchange protocol. In such a fair exchange scenario, each party owns a valuable secret message and they want to exchange their secrets in a fairness way so that at the end of the transaction, either both of them get the other’s secret or neither of them gets the other’s secret. Compared with previous fair exchange protocols, the protocol holds confidentiality, that is, except the two participating party, no one even the Trusted Third Party(TTP) can get exchanged items.

Key words: fair exchange protocol, verifiable encrypted message, bilinear pairing, confidentiality

摘要： 提出一种新的公平文档交换协议。在该协议中，交换双方都各自拥有一个秘密消息，他们想以一种公平的方式交换他们的秘密消息，即交换结束后，交换双方要么都获得对方的秘密消息，要么都没有获得对方的秘密消息。与其他的公平交换协议相比，该协议具有很强的隐私性，即使在需要可信任第三方参与解决协议争端的情况下，可信任第三方也无法获得交换过程中传输的秘密消息，因此除了交换双方，任何实体都无法获得交换过程中传输的秘密消息。

关键词: 公平交换协议, 可验证加密消息, 双线性配对, 隐私性

CLC Number: 

• TP393.08