Understanding Transparent Data Encryption (TDE)
http://msdn2.microsoft.com/en-us/library/bb934049(SQL.100).aspx
Database Encryption in SQL Server 2008 Enterprise Edition
http://msdn2.microsoft.com/en-us/library/cc278098(SQL.100).aspx
楼主说的是这个?
SQL Server 2008: Transparent data encryption feature - a quick overview
http://blogs.msdn.com/lcris/archive/2007/10/03/sql-server-2008-transparent-data-encryption-feature-a-quick-overview.aspx