Your master key system will be designed with the utmost care to your specification by our expert team. This resource-intensive operation should be scheduled during a period of low demand, unless the master key has been compromised.We provide a master keying service for any size system at no extra cost when using our cylinders. The keys are first decrypted with the old master key, and then encrypted with the new master key. The REGENERATE option re-creates the database master key and all the keys it protects. The MSDN page for ALTER MASTER KEY states:
Gm master key upgrade#
Regenerating the DMK key to upgrade to AES is only necessary once, and has no impact on future regenerations as part of a key rotation strategy. The time required to regenerate the DMK key to upgrade to AES depends upon the number of objects protected by the DMK. For more information about regenerating the DMK, see ALTER MASTER KEY (Transact-SQL). When a database has been upgraded from an earlier version, the DMK should be regenerated to use the newer AES algorithm. 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. The MSDN page for OPEN MASTER KEY states:
Gm master key password#
In order to recover the Master Key, and all the data encrypted using the Master Key as the root in the key hierarchy after the database has been moved, the user will have either use OPEN MASTER KEY statement using one of the password used to protect the Master Key, restore a backup of the Master Key, or restore a backup of the original Service Master Key on the new server. In case of the database being physically moved to a different server (log shipping, restoring backup, etc.), the database will contain a copy of the master Key encrypted by the original server Service Master Key (unless this encryption was explicitly removed using ALTER MASTER KEY DDL), and a copy of it encrypted by each password specified during either CREATE MASTER KEY or subsequent ALTER MASTER KEY DDL operations. The MSDN page for CREATE MASTER KEY states (emphasis added):įor SQL Server and Parallel Data Warehouse, the Master Key is typically protected by the Service Master Key and at least one password.
If you have a Certificate that is guaranteed to exist in the Database being restored, try using it: SELECT SIGNBYCERT( CERT_ID( '' If the current SMK is not the correct SMK, then the DMK won't be automatically decrypted and the operation will fail. Assuming that you have not opened the DMK explicitly (using the password supplied when creating it), decrypting the DMK will require the SMK. Such an operation would need to first decrypt the DMK in order to use it. In order to programmatically determine if the current SMK was used to protect the DMK, you should be able to simply attempt an operation that would require the DMK.
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