Encryption Solutions
TDE is actually only one of several SQL Server encryption solutions available. Each encryption solution works in different ways, however, so it is important to understand first what the available encryption solutions are and how they can be utilized.
• Cell-level encryption— Cell-level encryption encrypts individual database cells, rather than the entire database. This type of encryption is not supported for SharePoint databases.
• File-level encryption— File-level encryption includes technologies such as BitLocker and the Encrypting File System (EFS). These technologies encrypt the entire hard drive and can be used with SQL. They do not, however, encrypt backups of the SQL databases that are stored on other volumes.
• ...
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