C/A码（Coarse Acquistion Code）和P码（Precise Code）在L1上广播，加密码（encrypted code）只在L2上广播。摩托罗拉的射频降频变换器MRFIC1502是为了接收L1上的C/A码而设计的。
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如果你真的偏执，考虑添加密码和公钥认证的实现双因素认证。
If you're truly paranoid, consider adding password and public key authentication to achieve two-factor authentication.
设计采用命令加密和命令附加密码的双重保障机制来保障系统切换的安全性。
We adopted double safeguard mechanism called instruction encryption and instruction with password to ensure security of system-switching.
如果新的SQL Server服务器上不存在标准的SQL Server登录，则会添加密码为空的登录。
If a standard SQL server login does not exist on the new SQL server server, you can add the login with a NULL password.
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