Encrypt / Decrypt การเข้ารหัส (EnCode และ DeCode) ข้อความบน SQL Server Database

DECLARE @Plaintext VARCHAR(100);
SET  @Plaintext  = 'ข้อความต้นฉบับ';
SELECT EncryptByPassPhrase('THAICREATE', @Plaintext);

DECLARE @Ciphertext NVARCHAR(100);
SET  @Ciphertext  = 0x010000009B99B3832B655FCD9E0F99C72E90F27A8675A89545F45D2EF8F9969C59809B06;
SELECT CONVERT(VARCHAR(1000),DecryptByPassPhrase('THAICREATE', @Ciphertext));

CREATE FUNCTION [dbo].[fncEncode]
(
	@sInput VARCHAR(1000)
)
RETURNS NVARCHAR(1000) 
AS
BEGIN
    RETURN EncryptByPassPhrase('THAICREATE', @sInput);
END

CREATE FUNCTION [dbo].[fncDecode]
(
	@sInput NVARCHAR(1000)
)
RETURNS VARCHAR(1000) 
AS
BEGIN
    RETURN CONVERT(VARCHAR(100),DecryptByPassPhrase('THAICREATE', @sInput));
END

INSERT INTO Employee (EmpID, Name, Salary) VALUES ('E001','Sangsuree Nukitram',dbo.fncEncode('20000'));

SELECT * , dbo.fncDecode(Salary) AS NewSalary FROM Employee