How to Implement a Asymmetric Key encryption in sql server 2008 (with public and private keys)

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SQL-Server-2008R2

I have implemented a simple asymmetric key and used it.But not sure how private and public keys has to be generated and used.Here is my sql script which creates the asymmetric key and then uses it.

SQL

CREATE ASYMMETRIC KEY PacificSales09
    WITH ALGORITHM = RSA_512

    ENCRYPTION BY PASSWORD = 'MyPassword@Singhania@1';

Encryption--------------------
-----------------------
DECLARE @AsymID INT;

SET @AsymID = ASYMKEY_ID('PacificSales09');

--Encrypt the section Value with symmetric key MWSSymmetricConfigTableKey
UPDATE configuration_value
SET Section_value = ENCRYPTBYASYMKEY(@AsymID,'anodfsdfsdfnsmt')

WHERE Section_Name = 'MWSCommonConfig' AND Section_key = 'SMTPServer'

Decryption------------------
-------------------------------
DECLARE @AsymID INT;

SET @AsymID = ASYMKEY_ID('PacificSales09');
SELECT TOP 5000 CONVERT(CHAR(52), DECRYPTBYASYMKEY(@AsymID, Section_value, N'MyPassword@Singhania@1'))
FROM configuration_value WHERE Section_Name = 'MWSCommonConfig' AND Section_key = 'SMTPServer'

Posted 29-Sep-14 23:30pm

gsinghania2009

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Eduard Keilholz · Answer 1 · 2014-09-29T23:35:00

You can have the public and private key pair generated for you :

C#

public static void GenerateKeys(int keySize, out string publicKey, out string publicAndPrivateKey)
{
    using (var provider = new RSACryptoServiceProvider(keySize))
    {
        publicKey = provider.ToXmlString(false);
        publicAndPrivateKey = provider.ToXmlString(true);
    }
}

The public key is sent to anywhere you want, you can share is. It's used as a key to encrypt stuff. The private key is held secret. Only the private key can be used to decrypt data.

Does this cover your question, of do you need more detail?