你要问的东西需要高端加密技术。



查看此链接



using-passwords-with-sql-server-database-backup-files / [ ^ ]



此链接显示您可以在.bak文件中执行的备用。

The thing you are asking required high end encryption techniques.

Check this link

using-passwords-with-sql-server-database-backup-files/[^]

This link shows an alternate which you can do at .bak file.