Compared to the previous fair exchange protocols with a single semi-trusted third party, the newly constructed fair exchange protocol can further guarantee the security and fairness of the transaction due to the existence of the distributed semi-trusted third party.
该协议引入了分布式的半可信第三方，与已有的具有单一半可信第三方的公平交换协议相比，分布式半可信笫三方的存在使新协议的安全性和公平性得到了更好的保证。
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当然，这又摆出了如何确立可信第三方的身份的自举问题。
Of course, this leaves the bootstrap issue of how you establish the trusted third party's identity.
Kerberos是根据秘密密钥加密并使用可信第三方身份验证而设计的。
Kerberos was designed based on secret key cryptography and using trusted third party authentication.
尽管使用了非常有效且易于管理的可信第三方，但Kerberos也存在一些不足。
Though the use of a trusted third party, Kerberos, is very effective and manageable, it comes with a trade off.
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