sqlserver encrypts and decrypts data

– Create test table

CREATE TABLE TBLUser 
(    
    Name             nvarchar(30),     
    Password         varbinary(1000)
)

-Create a database master key

CREATE master key  ENCRYPTION BY PASSWORD ='passW@ord'

– Create a certificate

CREATE CERTIFICATE TestCert with SUBJECT = 'Test Certificate'

– Create a symmetric key

CREATE SYMMETRIC KEY TestSymmetric WITH ALGORITHM = AES_256
    ENCRYPTION BY CERTIFICATE TestCert 

– Use symmetric key to encrypt data

OPEN SYMMETRIC KEY TestSymmetric DECRYPTION BY CERTIFICATE TestCert;
INSERT INTO TBLUser values('张三', ENCRYPTBYKEY(Key_Guid(N'TestSymmetric'), '123456'));
CLOSE SYMMETRIC KEY TestSymmetric;

– View the encrypted data

SELECT * FROM TBLUser

– Decrypt data

OPEN SYMMETRIC KEY TestSymmetric DECRYPTION BY CERTIFICATE TestCert;
SELECT Name, CAST(DecryptByKey(password) as varchar(100)) Password FROM TBLUser;
CLOSE SYMMETRIC KEY TestSymmetric;

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