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CREATE DATABASE EncryptionTest; GO USE EncryptionTest; GO CREATE TABLE dbo.EncryptedData ( EncryptedCol VARBINARY(128) ); GO -- Note the use of a symmetric key encrypted with a password CREATE SYMMETRIC KEY DataEncrypt WITH ALGORITHM = AES_256 ENCRYPTION BY PASSWORD = '17SomeHiddenPassword!76'; OPEN SYMMETRIC KEY DataEncrypt DECRYPTION BY PASSWORD = '17SomeHiddenPassword!76'; GO INSERT INTO dbo.EncryptedData (EncryptedCol) VALUES (ENCRYPTBYKEY(KEY_GUID('DataEncrypt'), 'Big Brother DBA is now blind!' )); GO -- Only with the correct password does everything work. OPEN SYMMETRIC KEY DataEncrypt DECRYPTION BY PASSWORD = '17SomeHiddenPassword!76'; SELECT CONVERT(VARCHAR(MAX), DECRYPTBYKEY(EncryptedCol)) FROM dbo.EncryptedData; Now let's consider the case where you want to try and keep DBAs out of the data. That's the most difficult case. Manual practico para la construccion jaime nisnovich pdf to doc converter. Keeping DBAs from Seeing the Password(s) The first attempt is to simply create a view which uses the basic SELECT statement from the sample code.

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For instance. This does work because the password is set with the asymmetric key CREATE ASYMMETRIC KEY ASymKeyPwd WITH ALGORITHM = RSA_2048 ENCRYPTION BY PASSWORD = '17SomeHiddenPassword!76'; CREATE SYMMETRIC KEY SymKey WITH ALGORITHM = AES_256 ENCRYPTION BY ASYMMETRIC KEY AsymKeyPwd; -- Empty any rows DELETE FROM dbo.EncryptedData; GO -- Insert new data OPEN SYMMETRIC KEY SymKey DECRYPTION BY ASYMMETRIC KEY AsymKeyPwd WITH PASSWORD = '17SomeHiddenPassword!76'; INSERT INTO dbo.EncryptedData (EncryptedCol) VALUES (ENCRYPTBYKEY(KEY_GUID('SymKey'), 'Big Brother DBA is now blind!'

)); GO CLOSE SYMMETRIC KEY SymKey; GO -- Drop the view and recreate it DROP VIEW dbo.SeeEncryptedData; GO CREATE VIEW dbo.SeeEncryptedData AS SELECT CONVERT(VARCHAR(MAX), DECRYPTBYKEYAUTOASYMKEY(ASYMKEY_ID('AsymKeyPwd'), N'17SomeHiddenPassword!76', EncryptedCol)) AS 'EncryptedCol' FROM dbo.EncryptedData; GO SELECT EncryptedCol FROM dbo.SeeEncryptedData; When it comes to creating the view, the star player is the function DecryptByKeyAutoAsymKey() which does allow us to specify a password for the asymmetric key. If we specify the right asymmetric key, SQL Server will automatically open the symmetric key that is encrypted by the asymmetric key, giving us the results we want.

We're done, right? There's a flaw in building the view this way. However, there are three issues that cannot be overcome: • DBAs grant access to the view. They themselves would be able to query the data through the view. • Likely it's going to be a DBA who runs the CREATE VIEW code in the database.

That means he or she will have the password embedded in the code. • There are tools publicly available, including scripts, that can beat this encryption. Some of them are free. Therefore, if you want the end users to be able to query the encrypted data, either they are going to have to know the functions (and the password to decrypt the key) or you're going to have to build some interface that presents the data for them. The Simpler Case Where DBAs Can View the Data If you're not restricted to where DBAs can't view the data, things are much simpler because SQL Server can handle all the key escrow. Let's set up that situation.

What about if SQL Server handles key escrow? -- Clean up DROP VIEW dbo.SeeEncryptedData; GO DELETE FROM dbo.EncryptedData; GO -- Set up the chain CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'SomeStr0ngPassw0rd!' ; GO CREATE ASYMMETRIC KEY ASymKeyChain WITH ALGORITHM = RSA_2048; GO CREATE SYMMETRIC KEY SymKeyChain WITH ALGORITHM = AES_256 ENCRYPTION BY ASYMMETRIC KEY AsymKeyChain; GO OPEN SYMMETRIC KEY SymKeyChain DECRYPTION BY ASYMMETRIC KEY ASymKeyChain; GO INSERT INTO dbo.EncryptedData (EncryptedCol) VALUES (ENCRYPTBYKEY(KEY_GUID('SymKeyChain'), 'Big Brother DBA is now blind!' )); GO CLOSE SYMMETRIC KEY SymKeyChain; GO The view definition is basically the same except now we don't need a password. In this case, you want to specify NULL, not an empty string (') which isn't the same thing. The second case SQL Server will treat the asymmetric key as having a blank password and you won't get the decryption right. So here's the revised view definition.