ALTER DATABASE ENCRYPTION KEY (Transact-SQL)
Applies to:
SQL Server
Analytics Platform System (PDW)
Alters an encryption key and certificate that is used for transparently encrypting a database. For more information about transparent database encryption, see Transparent Data Encryption (TDE).
Transact-SQL syntax conventions
Syntax
-- Syntax for SQL Server
ALTER DATABASE ENCRYPTION KEY
REGENERATE WITH ALGORITHM = { AES_128 | AES_192 | AES_256 | TRIPLE_DES_3KEY }
|
ENCRYPTION BY SERVER
{
CERTIFICATE Encryptor_Name |
ASYMMETRIC KEY Encryptor_Name
}
[ ; ]
-- Syntax for Parallel Data Warehouse
ALTER DATABASE ENCRYPTION KEY
{
{
REGENERATE WITH ALGORITHM = { AES_128 | AES_192 | AES_256 | TRIPLE_DES_3KEY }
[ ENCRYPTION BY SERVER CERTIFICATE Encryptor_Name ]
}
|
ENCRYPTION BY SERVER CERTIFICATE Encryptor_Name
}
[ ; ]
Note
To view Transact-SQL syntax for SQL Server 2014 (12.x) and earlier versions, see Previous versions documentation.
Arguments
REGENERATE WITH ALGORITHM = { AES_128 | AES_192 | AES_256 | TRIPLE_DES_3KEY }
Specifies the encryption algorithm that is used for the encryption key.
ENCRYPTION BY SERVER CERTIFICATE Encryptor_Name
Specifies the name of the certificate used to encrypt the database encryption key.
ENCRYPTION BY SERVER ASYMMETRIC KEY Encryptor_Name
Specifies the name of the asymmetric key used to encrypt the database encryption key.
Remarks
The certificate or asymmetric key that is used to encrypt the database encryption key must be located in the master system database.
When the database owner (dbo) is changed, the database encryption key does not have to be regenerated.
After a database encryption key has been modified twice, a log backup must be performed before the database encryption key can be modified again.
Permissions
Requires CONTROL permission on the database and VIEW DEFINITION permission on the certificate or asymmetric key that is used to encrypt the database encryption key.
Examples
The following example alters the database encryption key to use the AES_256
algorithm.
-- Uses AdventureWorks
ALTER DATABASE ENCRYPTION KEY
REGENERATE WITH ALGORITHM = AES_256;
GO
See Also
Transparent Data Encryption (TDE)
SQL Server Encryption
SQL Server and Database Encryption Keys (Database Engine)
Encryption Hierarchy
ALTER DATABASE SET Options (Transact-SQL)
CREATE DATABASE ENCRYPTION KEY (Transact-SQL)
DROP DATABASE ENCRYPTION KEY (Transact-SQL)
sys.dm_database_encryption_keys (Transact-SQL)