CREATE DATABASE ENCRYPTION KEY (Transact-SQL)
Creates an encryption key that is used for transparently encrypting a database. For more information about transparent database encryption, see Understanding Transparent Data Encryption (TDE).
A database encryption key is required before a database can be encrypted by using Transparent Database Encryption (TDE). When a database is transparently encrypted, the whole database is encrypted at the file level, without any special code modifications. The certificate or asymmetric key that is used to encrypt the database encryption key must be located in the master system database.
Database encryption statements are allowed only on user databases.
The database encryption key cannot be exported from the database. It is available only to the system, to users who have debugging permissions on the server, and to users who have access to the certificates that encrypt and decrypt the database encryption key.
The database encryption key does not have to be regenerated when a database owner (dbo) is changed.
The following example creates a database encryption key by using the AES_256 algorithm, and protects the private key with a certificate named MyServerCert.
USE AdventureWorks2008R2; GO CREATE DATABASE ENCRYPTION KEY WITH ALGORITHM = AES_256 ENCRYPTION BY SERVER CERTIFICATE MyServerCert; GO