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copied!<p>The default hash algorithm type is SHA1. There are two ways that you can change this.</p> <p>1) If you are working with IIS 7 you can update this using the "Machine Key" configuration (shown below). This allows you to choose the encryption method from a list of available options and specify the keys or the key generation options.</p> <p><img src="https://i.stack.imgur.com/Uz6lV.png" alt="Machine Key configuration page from IIS 7 administration tool"></p> <p>2) If you are working with IIS 6 you can change the hash algorithm type using the membership element in the web.config file:</p> <pre><code><membership defaultProvider="provider name" userIsOnlineTimeWindow="number of minutes" hashAlgorithmType="SHA1"> <providers>...</providers> </membership> </code></pre> <p>According to the documentation the string value of the <a href="http://msdn.microsoft.com/en-us/library/1b9hw62f(VS.85).aspx" rel="noreferrer">hashAlgorithmType</a> attribute can be any of the provided .Net hashing algorithm types. A bit of digging shows that the valid values for ASP.Net 2, 3 and 3.5 are <code>MD5</code>, <code>RIPEMD160</code>, <code>SHA1</code>, <code>SHA256</code>, <code>SHA384</code>, <code>SHA512</code>. The important part here is that all these classes inherit from <code>HashAlgorithm</code>.</p> <p>The value of the <a href="http://msdn.microsoft.com/en-us/library/1b9hw62f(VS.85).aspx" rel="noreferrer">hashAlgorithmType</a> attribute can also be an entry from the <a href="http://msdn.microsoft.com/en-us/library/ff3k1hh4.aspx" rel="noreferrer">cryptoNameMapping</a> element in the machine.config file. You could use this if you require a 3rd party hashing algorithm. The machine.config file can typically be found in <code>C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG</code> if you are using ASP.Net 2 or later. You can read more about setting these values <a href="http://msdn.microsoft.com/en-us/library/693aff9y.aspx" rel="noreferrer">here</a>.</p>

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