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POSQL based encryption performance
 

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    <p>I am doing some research for a future project and it requires some data to be encrypted. </p> <p>In my research today, I have noticed that there are many different encryption algorithms (including AES, Triple-DES, X-DES etc) and I wish to use one of the algorithms in SQL-Server (2008r2 express probs), how would you recommend doing this, like best practices etc?</p> <p>I am planning to do something like the following:</p> <pre><code>-- Create the master key. CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'Som3Rand0m!3y?na' -- Create the cert. CREATE CERTIFICATE someCert WITH SUBJECT = 'c3p009xFR?' -- Create Symmetric Key CREATE SYMMETRIC KEY someSymmetricKey WITH ALGORITHM = TRIPLE_DES ENCRYPTION BY CERTIFICATE someCert </code></pre> <p>And use it in the following way: </p> <pre><code>declare @sql varchar(8000) set @sql = 'OPEN SYMMETRIC KEY someSymmetricKey DECRYPTION BY CERTIFICATE someCert ' exec (@sql) -- Check the table SELECT col1, Convert(varchar(max), DECRYPTBYKEY(col2)) as col2 FROM myTable -- dont forget to close the symmetric key again afterwards. CLOSE SYMMETRIC KEY someSymmetricKey </code></pre> <p>I guess this is the correct way to do it (I read up on it ages ago and saved an example, so just double checking :])?</p> <p>Also, are there really any performance differences (or security differences, like one is easier to break than another) between using the different encryption algorithms? &lt;&lt;- this is the one i was really trying to find out about/most important.</p> <p>Lastly, if I move the database to a different server, I guess I can just re-create the key/cert in the same way and I will be able to get the data back etc?</p> <p>Any good blog posts/links/whitepapers would be greatly appreciated :) (most that ive read have been quiet bad tbh)</p> <p>Thanks for reading :D</p>
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