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The T-SQL syntax for performing encryption and decryption using certificates is very simalarily to the T-SQL used with asymmetric keys.

The main difference, syntactically, is that the -- use the database tempdb USE tempdb; -- create permanent temp table CREATE TABLE Certificate Temp Table ( Id INT IDENTITY(1,1) PRIMARY KEY, Plain Text NVARCHAR(100), Cipher Text VARBINARY(MAX) ); -- crate self signed certificate encrypting the private -- key with the supplied -- password CREATE CERTIFICATE Self Signed Certificate ENCRYPTION BY PASSWORD = 'Certificate Strong Password' WITH SUBJECT = 'Self Signed Certificate', EXPIRY_DATE = '12/01/2030'; -- declare and set plaintext to be encrypted DECLARE @str NVARCHAR(100); SET @str = 'Secret information...shhhhhh'; -- insert plaintext and encrypted data into the temp table, -- using the public key of the specified certificate INSERT INTO Certificate Temp Table (Plain Text, Cipher Text) VALUES(@str, Encrypt By Cert(Cert_ID('Self Signed Certificate'), @str)); -- display data in table SELECT * FROM Certificate Temp Table; -- decrypt data and display SELECT CONVERT(NVARCHAR(MAX), Decrypt By Cert(Cert_Id('Self Signed Certificate'), Cipher Text, N'Certificate Strong Password')) As Plain Text FROM Certificate Temp Table; -- delete certificate and drop table DROP CERTIFICATE Self Signed Certificate; DROP TABLE Certificate Temp Table; As discussed in An Overview of Cryptographic Systems and Encrypting Database Data, digital signatures can be used to ensure the integrity of a message or data.

Unfortunately, as one might guess from the previous sections, SQL Server Management Studio is lacking when it comes to wizard-based creation of keys and certificates.

Therefore, it is impossible for a developer to completely rid him or herself from writing a little T-SQL.

See [5] for more information on creating certificates in SQL Server 2005.

' END AS Integrity Check FROM Asymmetric Temp; -- add a '0' to the end of the plaintext UPDATE Asymmetric Temp SET Plain Text = Plain Text '0'; -- check the integrity of the data stored by checking the -- signature against the plaintext SELECT Plain Text, CONVERT(NVARCHAR(100), Decrypt By Asym Key(Asym Key_ID('Another Asymmetric Key'), Cipher Text, N'Very Very Strong Password')) AS Decrypted, CASE WHEN Verify Signed By Asym Key(Asym Key_Id('Another Asymmetric Key'), Plain Text, Signature) = 1 THEN N'The data has not been changed.' ELSE N'The data has been modified!

' END AS Integrity Check FROM Asymmetric Temp; -- delete key and table DROP ASYMMETRIC KEY Another Asymmetric Key; DROP TABLE Asymmetric Temp; to hold the digital signatures for each record.

This time the function outputs 0, indicating that the signature is no longer valid and, therefore, that the data has been changed.

Note that in a real world application we would more than likely encrypt the plaintext first (not store it directly), and then sign the encrypted ciphertext.

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