This topic describes how to to protect a database by using transparent data encryption (TDE), and then move the database to another instance of SQL Server by using SQL Server Management Studio or Transact-SQL. TDE performs real-time I/O encryption and decryption of the data and log files. The DEK is a symmetric key secured by using a certificate stored in the master database of the server or an asymmetric key protected by an EKM module. The encryption uses a database encryption key (DEK), which is stored in the database boot record for availability during recovery.
SQL Server – New Database Backup Encryption with SQL Server 2014. July 21, 2015 by Hareesh Gottipati.
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On the minus side, cell-level encryption requires schema modification because all encrypted data must be stored using the varbinary data type. There will also be expensive table scans because all indexes on the table are encrypted and therefore won’t be used. There’s also a cost to the overall performance of the database because additional processing is required for encrypting and decrypting data.
SQL Server provides database administrators with several options to encrypt data when transmitted through the network, while creating a backup, or when stored on the server or network. In this article, I will guide you through the different encryption options that are available in SQL Server 2014 to encrypt confidential data in the SQL Server database. These encryption options include: transparent data encryption, column-level encryption, encryption of SQL Server objects definitions, backup encryption, encryption of SQL Server connections, database file-level encryption through windows EFS and BitLocker drive encryption.
This feature is supported on the Enterprise, Business Intelligence and Standard
versions of SQL Server 2014, but an encrypted backup can be .
Encryption Hierarchy Information about the encryption hierarchy in SQL Server. Choose an Encryption Algorithm Information about how to select an.
For an example using SQL Server Management Studio, see Create a. This topic describes the steps necessary to create an encrypted backup using Transact-SQL.
If the certificate or asymmetric key does not exist on the server, then the database will not be restored. Restoring an encrypted database is just as simple as restoring an unencrypted database. If the certificate or asymmetric key has been lost, then there is no way to restore the database from its backup. The same RESTORE DATABASE command is used, as normal. The only requirement is that the certificate, or asymmetric key, that was used to encrypt the backup, must exist on the instance before attempting to restore the database.
If the database is a part of an availability group, then cluster name and availability group name are used instead of server name and instance name. DatabaseBackup creates a directory structure with server name, instance name, database name, and backup type under the backup root directory.
You must use either
a . Now, a new feature in SQL Server 2014 called Encrypted Backups, lets you
choose to encrypt the backup file during a backup operation.
The creation of the certificate from the backup file where the certificate is expired returns a warning, but it will import correctly. If the certificate has expired, but does not exist on the SQL Server instance, the certificate can still be created from the backup file. Restoring the database from an expired certificate is done just like normal, provided that the certificate already exists on the server.