DATETIME SELECT SELECT INTO DATE PAD STRING DYNAMIC SQL CURSOR MONEY FORMAT PERCENT STORED PROCEDURE SQL SERVER AGENT JOB OPTIMIZATION WHILE LOOP OVER PARTITION BY UPDATE
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How to encrypt passwords with asymmetric key?

Execute the following Microsoft SQL Server T-SQL script in SSMS Query Editor to create a user login table and populate it with 2 logins and EncryptByAsymKey encrypted passwords. Use DecryptByAsymKey to verify passwords for the logins.

-- SQL Server password encryption with assymetric key

USE AdventureWorks2008;

GO

 

-- DROP TABLE dbo.UserLogin

CREATE TABLE dbo.UserLogin (

  UserLoginID INT    IDENTITY ( 1 , 1 )    PRIMARY KEY,

  LoginName   CHAR(30)    NOT NULL,

  [PassWord]  VARBINARY(MAX)    NOT NULL,

  IsActive    BIT    NOT NULL CONSTRAINT DF_UserLogin_IsActive DEFAULT ((1)),

  CreateDate  DATETIME NOT NULL CONSTRAINT DF_UserLogin_CreateDate DEFAULT (getdate()),

  ModifyDate  DATETIME NOT NULL CONSTRAINT DF_UserLogin_ModifyDate DEFAULT (getdate()),

  ModifiedBy  CHAR(6)    NOT NULL CONSTRAINT DF_UserLogin_ModifiedBy DEFAULT ('system'))

GO

 

-- drop ASYMMETRIC KEY Asym_PassWord

CREATE ASYMMETRIC KEY Asym_PassWord WITH ALGORITHM = RSA_512
ENCRYPTION BY PASSWORD = N'secreT007!'

 

DECLARE  @CipherString VARBINARY(MAX);

 

SELECT @CipherString = EncryptByAsymKey(AsymKey_ID('Asym_PassWord'),N'SecretPass!01');

 

INSERT INTO UserLogin

           (LoginName,

            [PassWord])

VALUES     ('administrator',@CipherString);

GO

 

DECLARE  @CipherString VARBINARY(MAX);

 

SELECT @CipherString = EncryptByAsymKey(AsymKey_ID('Asym_PassWord'),N'OperPass99$');

 

INSERT INTO UserLogin

           (LoginName,

            [PassWord])

VALUES     ('operator',@CipherString);

GO

 

SELECT *

FROM   UserLogin

GO

 

-- Following query can be used to test an entered password:

SELECT      LoginName,

            PassWordDecrypted= convert(nvarchar(128),

            DecryptByAsymKey(AsymKey_ID('Asym_PassWord'),

            [PassWord], N'secreT007!' ))

FROM UserLogin

WHERE LoginName = 'operator'

GO

 

SELECT      LoginName,

            PassWordDecrypted= convert(nvarchar(128),

            DecryptByAsymKey(AsymKey_ID('Asym_PassWord'),

            [PassWord], N'secreT007!' ))

FROM UserLogin

WHERE LoginName = 'administrator'

GO

-- Cleanup

DROP TABLE dbo.UserLogin

------------

Related articles:

How to: Encrypt a Column of Data

SQL Server 2005 Encryption Encryption and data length limitations

 

Exam Prep 70-461
Exam 70-461
DATETIME SELECT SELECT INTO DATE PAD STRING DYNAMIC SQL CURSOR MONEY FORMAT PERCENT STORED PROCEDURE SQL SERVER AGENT JOB OPTIMIZATION WHILE LOOP OVER PARTITION BY UPDATE