When this is done, if you backup a database and try to restore it from another instance, it will failed because the instance cannot decrypt the data. When turn on Encryption on a database, the data is automatically encrypted. WITH ALGORITHM = AES_128 //ĮNCRYPTION BY SERVER CERTIFICATE MyServerCert This is given a name Database Encryption Key which is not really a key, but just confusion. The certificate plus an algorithm (certificate's public key + algorithm) provides a mechanism for the database to encrypt data. Alternatively, you may specify a password to encrypt the private key part.ĬREATE CERTIFICATE MyServerCert WITH SUBJECT = 'My DEK Certificate' When create a certificate (generates private public key pair), the private key is automatically encrypted by the Database Master Key. Once the DMK has been decrypted, you have the option of enabling automatic decryption in the future by using the ALTER MASTER KEY REGENERATE statement to provision the server with a copy of the DMK, encrypted with the service master key (SMK). You must use the OPEN MASTER KEY statement to decrypt the database master key (DMK). "When a database is first attached or restored to a new instance of SQL Server, a copy of the database master key (encrypted by the service master key) is not yet stored in the server. Note that a copy of the master key is also stored in the master database and encrypted by the Service Master Key (created at SQL setup), so SQL Server can automatically decrypt the Master Key when it's used. The Master Key is encrypted by the user provided password. The following statement creates a Database Master Key.ĬREATE MASTER KEY ENCRYPTION BY PASSWORD = '' SQL Server use Master Key to protect the private key part of a certificate/asymmetric key (has public & private key). The Master Key is a symmetric key (encryption & decryption both use the same password).
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