Sqlserver encrypts and decrypts data

• – sqlserver Encrypt data 、 Decrypt
  • – Create test table
  • – Create database master **
  • – Create certificate
  • – Create symmetry **
  • – Use symmetric secret keys to encrypt data
  • – View encrypted data
  • – Decrypt data

– sqlserver Encrypt data 、 Decrypt

– Create test table

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

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– Create database master **

CREATE master key  ENCRYPTION BY PASSWORD ='[email protected]'

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– Create certificate

CREATE CERTIFICATE TestCert with SUBJECT = 'Test Certificate'

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– Create symmetry **

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

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– Use symmetric secret keys to encrypt data

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

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– View encrypted data

SELECT * FROM TBLUser

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– 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;