Even basic database elements such as creating an index or using foreign keys often do not work with cell-level or column-level encryption schemes because the use of these features inherently leak information. Custom schemes are often used to resolve equality searches and ranged searches often cannotīe used at all. These issues are not unique to SQL Server other database management systems face similar limitations. SQL Server 2005, the column data type must be changed to varbinary ranged and equality searches are not allowed and the application must call built-ins (or stored procedures or views that automatically use these built-ins) to handleĮncryption and decryption, all of which slow query performance. For example, to use encryption in Microsoft Implementing encryption in a database traditionally involves complicated application changes such as modifying table schemas, removing functionality, and significant performance degradations. It is designed to provide protection for the entire database at rest without affectingĮxisting applications. Transparent data encryption (TDE) is a new encryption feature introduced in Microsoft ® SQL Server ™ 2008.

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