A private key file less than 2500 bytes in encrypted format. The specifications that you need to use for a certificate with SQL Server are: There are numerous third parties that you can contact to create certificates, as well as lots of software that will achieve this task. I will not cover the myriad of ways that you can get a certificate for use with SQL Server. Please be sure you protect your certificates and passwords carefully or your backup encryption may not be as valuable as you expect. It is easy to make a mistake in securing and rotating your certificates. Note: Certificate and key management is a complex task. We will use a certificate supplied by a third party as opposed to a self generated certificate inside SQL Server. In this article, we will look at the native backup encryption available in SQL Server 2014 and above. SQL Server provides a few ways to encrypt backups, and there are numerous third party tools, such as SQL Backup, that perform encryption as well. Observe the following code that shows that I can create the same key twice as is evidence by my encrypting a value with the "first" key, dropping the key, re-generating it with the same KEY_SOURCE and IDENTITY_VALUE, and then decrypting the encrypted value.As security becomes more and more important to data professionals, one of the more basic things a DBA or sysadmin must do is protect the backup files for their databases. Your assessment is correct in that by knowing those two values, you can re-create the key. If you need to have the ability to duplicate a symmetric key, you should provide KEY_SOURCE and IDENTITY_VALUE. 
I tried the next code, but seems it is not safe to me, because if you know KEY_SOURCE and IDENTITY_VALUE you actually do not need original Database Master Key and Certificate to decrypt the data CREATE SYMMETRIC KEY MySymmetricKey WITH KEY_SOURCE = '', ALGORITHM = AES_256, IDENTITY_VALUE = '' ENCRYPTION BY CERTIFICATE MyEncryptCert Without it I can not decrypt the encrypted data if I move the encrypted table to another Database. BACKUP MASTER KEY TO FILE = 'c:\temp\key' ENCRYPTION BY PASSWORD = '' īACKUP CERTIFICATE MyEncryptCert TO FILE = 'c:\temp\cert' WITH PRIVATE KEY(ENCRYPTION BY PASSWORD='', FILE='C:\temp\cert.pvk')īut I can not backup Symmetric Key. I am able to backup Database Master Key and Certificate. SET = ENCRYPTBYKEY(KEY_GUID('MySymmetricKey'), '')
How I encrypt data OPEN SYMMETRIC KEY MySymmetricKey DECRYPTION BY CERTIFICATE MyEncryptCert I use the next code to create SQL Encryption keys CREATE MASTER KEY ENCRYPTION BY PASSWORD = ''ĬREATE CERTIFICATE MyEncryptCert WITH SUBJECT = 'Descryption', EXPIRY_DATE = ''ĬREATE SYMMETRIC KEY MySymmetricKey WITH ALGORITHM = AES_256 ENCRYPTION BY CERTIFICATE MyEncryptCert
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