Скачать или смотреть T-SQL: column-level encryption

--step 1
USE TESTDB ;
CREATE MASTER KEY ENCRYPTION BY
PASSWORD = '123Alex!@#$789';
--DROP MASTER KEY

--step 2
CREATE TABLE TABLE3
(ID int,
PERSONNAME nvarchar(200),
AGE int,
HOBBY nvarchar(200),
SALARY varbinary(128))

--step 3
CREATE CERTIFICATE MyCertificate1
WITH SUBJECT = 'Secret info - Salary';
GO
--drop CERTIFICATE MyCertificate1

CREATE SYMMETRIC KEY SSN_Key_01
WITH ALGORITHM = AES_256
ENCRYPTION BY CERTIFICATE MyCertificate1;
GO
--drop SYMMETRIC KEY SSN_Key_01

--step 4
OPEN SYMMETRIC KEY SSN_Key_01
DECRYPTION BY CERTIFICATE MyCertificate1;
INSERT INTO TABLE3 VALUES
(1,'Alex',40,'skateboarding', EncryptByKey(Key_GUID('SSN_Key_01'), '1000')),
(2,'John',32,'wrestling',EncryptByKey(Key_GUID('SSN_Key_01'), '1500')),
(3,'Asti',25,'jogging',EncryptByKey(Key_GUID('SSN_Key_01'), '24560')),
(4,'Jay',53,'football',EncryptByKey(Key_GUID('SSN_Key_01'), '502')),
(5,'Selena',40,'yoga',EncryptByKey(Key_GUID('SSN_Key_01'), '2500'))
--truncate table TABLE3
--DROP TABLE TABLE3

--step 5
OPEN SYMMETRIC KEY SSN_Key_01
DECRYPTION BY CERTIFICATE MyCertificate1;

SELECT
*,
CONVERT(varchar, DecryptByKey(SALARY)) AS [Decrypted Salary]
FROM TABLE3

CLOSE SYMMETRIC KEY SSN_Key_01