如果系统找到一个匹配文件保护的密钥，那么这个进程就可以对文件密钥和文件内容进行解密。
If the system finds a key matching the file protection, the process is able to decrypt the file key and file content.
YBX代理多重签名方案是不安全的，攻击者在不知道原始签名者密钥的情况下，能够伪造代理签名密钥，假冒代理签名者对文件进行签名。
The proxy multi-signature scheme called YBX is not safe. An attacker can forge the key pair of proxy signature without the original private key, and disguise himself as proxy to sign document.
用户只要使用一把密钥，就可以在服务器上、跨网络及在本地计算机上对文件进行加密。
Files can be encrypted on the server, across the network, and on a local computer with a single user key.
用户只要使用一把密钥，就可以在服务器上、跨网络及在本地计算机上对文件进行加密。
Files can be encrypted on the server, across the network, and on a local computer with a single user key.
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