DecryptByKey (Transact-SQL)
SQL Server 2005
使用對稱金鑰為資料解密。
A. 使用對稱金鑰解密
下列範例是利用對稱金鑰為加密文字解密。
-- First, open the symmetric key with which to decrypt the data.
OPEN SYMMETRIC KEY SSN_Key_01
DECRYPTION BY CERTIFICATE HumanResources037;
GO
-- Now list the original ID, the encrypted ID, and the
-- decrypted ciphertext. If the decryption worked, the original
-- and the decrypted ID will match.
SELECT NationalIDNumber, EncryptedNationalID
AS 'Encrypted ID Number',
CONVERT(nvarchar, DecryptByKey(EncryptedNationalID))
AS 'Decrypted ID Number'
FROM HumanResources.Employee;
GO
B. 使用對稱金鑰和驗證雜湊解密
下列範例會為隨驗證器一同加密的資料解密。
-- First, open the symmetric key with which to decrypt the data
OPEN SYMMETRIC KEY CreditCards_Key11
DECRYPTION BY CERTIFICATE Sales09;
GO
-- Now list the original card number, the encrypted card number,
-- and the decrypted ciphertext. If the decryption worked,
-- the original number will match the decrypted number.
SELECT CardNumber, CardNumber_Encrypted
AS 'Encrypted card number', CONVERT(nvarchar,
DecryptByKey(CardNumber_Encrypted, 1 ,
HashBytes('SHA1', CONVERT(varbinary, CreditCardID))))
AS 'Decrypted card number' FROM Sales.CreditCard;
GO
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