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	<title>Rex Flex &#187; SQL Server</title>
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	<description>Rants of a software developer</description>
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		<title>AES/Rijndael Encryption</title>
		<link>http://rexflex.net/2008/08/aesrijndael-encryption/</link>
		<comments>http://rexflex.net/2008/08/aesrijndael-encryption/#comments</comments>
		<pubDate>Thu, 07 Aug 2008 05:30:07 +0000</pubDate>
		<dc:creator>Rex Morgan</dc:creator>
				<category><![CDATA[C#]]></category>
		<category><![CDATA[Encryption]]></category>
		<category><![CDATA[Programming]]></category>
		<category><![CDATA[SQL Server]]></category>
		<category><![CDATA[Technology]]></category>
		<category><![CDATA[AES]]></category>
		<category><![CDATA[best practices]]></category>
		<category><![CDATA[CLR]]></category>
		<category><![CDATA[Reporting Services]]></category>
		<category><![CDATA[Rijndael]]></category>
		<category><![CDATA[Sensitive Data]]></category>

		<guid isPermaLink="false">http://www.rexflex.net/?p=144</guid>
		<description><![CDATA[I&#8217;ve been pretty busy with work lately, but it has been very interesting. The past couple of days I&#8217;ve been working with the AES/Rijndael to encrypt sensitive user data in the application I&#8217;m currently working on. It has been pretty &#8230; <a href="http://rexflex.net/2008/08/aesrijndael-encryption/">Continue reading <span class="meta-nav">&#8594;</span></a>]]></description>
			<content:encoded><![CDATA[<p>I&#8217;ve been pretty busy with work lately, but it has been very interesting.  The past couple of days I&#8217;ve been working with the <a href="http://en.wikipedia.org/wiki/Advanced_Encryption_Standard">AES</a>/<a href="http://blogs.msdn.com/shawnfa/archive/2006/10/09/The-Differences-Between-Rijndael-and-AES.aspx">Rijndael</a> to encrypt sensitive user data in the application I&#8217;m currently working on.  It has been pretty interesting and has proven to be quite a learning experience.</p>
<p>The main reason it has been a challenge is that some of this data that we&#8217;re encrypting needs to be decrypted and searched through for reports.  We have already decided on using <a href="http://www.microsoft.com/sql/technologies/reporting/default.mspx">SQL Server Reporting Services</a> (which I haven&#8217;t worked with before) to handle these reports, however there was the question of decrypting these fields through SQL Server.  Luckily we should be able to <a href="http://msdn.microsoft.com/en-us/library/w2kae45k(VS.80).aspx">create CLR User-Defined functions</a> to handle this.</p>
<p>I have also spent some time cleaning up the solution.  This particular project has been going on for the past year and a half (or so) and has had quite a few hands touching it.  I went ahead and organized the projects in the solution and fixed the dependency problems that everyone had been <em>just dealing with</em> for the past year or so.  I think taking care of these issues will make my life a lot easier in the long run.</p>
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