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其次，对UAP协议进行安全分析，由于其确认密钥完全依赖于服务器的长期私钥，因此它不具有前向保密性和密钥泄漏的安全性。
Secondly, the UAP protocol is analysed, because the key confirmation completely lies on the long-term private key, so it does not achieve forward secrecy, and resists key-compromise impersonation.
它提供的安全属性包括群组密钥保密性、前向保密和后向保密。
The scheme provides group key secrecy, forward secrecy and backward secrecy.
在任何一方向方披露前已为该方知悉的非保密性资料；
Non-confidential information that has come to the attention of the receiving party before the disclosure of the other party;
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