The conception of Trusted Network Connection (TNC) is introduced, and the problem of TNC protocol extend is analyzed.Direct Anonymous Attestation(DAA) protocol is descripted.

• 该文介绍了可信计算环境下可信网络连接的基本概念，分析了TNC协议扩展存在的问题，介绍了直接匿名证明DAA协议。