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<title>Yubico Forum</title>
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<updated>2014-12-27T01:59:57+01:00</updated>

<author><name><![CDATA[Yubico Forum]]></name></author>
<id>https://forum.yubico.com/feed.php?f=30&amp;t=1687</id>
<entry>
<author><name><![CDATA[cavalierlwt]]></name></author>
<updated>2014-12-27T01:59:57+01:00</updated>
<published>2014-12-27T01:59:57+01:00</published>
<id>https://forum.yubico.com/viewtopic.php?t=1687&amp;p=6633#p6633</id>
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<title type="html"><![CDATA[Unable to select 'Fixed 64 byte input']]></title>

<content type="html" xml:base="https://forum.yubico.com/viewtopic.php?t=1687&amp;p=6633#p6633"><![CDATA[
I have a yubikey with 2.2.3.<br />I am trying to a secret key for challenge-response HMCA-SHA1 mode<br />The guide I read indicated that I should use 'fixed 64 byte input' as opposed to 'variable input'<br />I am unable to select the fixed 64 byte option. <br />When I plug in my Yubikey neo, the tool does allow me to select  the 'fixed 64 byte' option<br />Is this option only available to certain firmware revisions?<p>Statistics: Posted by <a href="https://forum.yubico.com/memberlist.php?mode=viewprofile&amp;u=3412">cavalierlwt</a> — Sat Dec 27, 2014 1:59 am</p><hr />
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