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    <title>2012 Reports</title>
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    <description><![CDATA[Discussion forum for Cryptology ePrint Archive reports posted in 2012. Please put the report number in the subject.]]></description>
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    <pubDate>Mon, 27 Feb 2012 23:42:36 -0700</pubDate>
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    <item>
      <title>2012/074 There is no flaw</title>
      <link>http://eprint.iacr.org/forum/read.php?12,604,604#msg-604</link>
      <author>lindell</author>
      <description><![CDATA[There is no flaw whatsoever in the HMAC proof. The so-called flaw pointed out by Koblitz and Menezes is a standard proof in the non-uniform model (where adversaries are modeled as families of polynomial-size circuits, or equivalently as polynomial-time Turing machines with advice). This type of proof is known to anyone who has taken a basic theory of cryptography (or complexity) course, and the security guaranteed is based on the assumption that the underlying compression function is &quot;secure&quot; (as defined in the paper) for non-uniform adversaries.

It is a shame that some people do not have enough humility to first approach the authors and ask if there is or is not a mistake. I would also hope that other people in the community take this type of behavior as an example of what NOT to do. If you find a flaw in someone's proof (something that is not the case here), then send them a nice email. You will get a nice acknowledgement, you will be known as a gracious person, and you will have done something for science. This is much better than writing an entire paper about it and getting a line on your CV that isn't worth too much. You're better off spending your time doing new and productive research.]]></description>
      <category>2012 Reports</category>
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      <pubDate>Mon, 27 Feb 2012 23:42:36 -0700</pubDate>
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