一切非匿名。
另外，为了保证文件下载的安全性，最好使用非匿名方式登陆下载。
Moreover username-based log-in and download shall be preferred in order to guarantee the security of file download.
WTLS握手协议不满足前向安全性，非匿名验证模式下不满足用户匿名性，完全匿名模式下易遭受中间人攻击。
WTLS handshake protocol doesn't provide forward security, and lacks of user anonymity when not in the anonymous mode. It is vulnerable to man-in-the-middle attacks in completely anonymous mode.
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