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<title>Yubico Forum</title>
<subtitle>...visit our web-store at</subtitle>
<link href="https://forum.yubico.com/index.php" />
<updated>2012-02-24T15:22:04+01:00</updated>

<author><name><![CDATA[Yubico Forum]]></name></author>
<id>https://forum.yubico.com/feed.php?f=16&amp;t=753</id>
<entry>
<author><name><![CDATA[samir]]></name></author>
<updated>2012-02-24T15:22:04+01:00</updated>
<published>2012-02-24T15:22:04+01:00</published>
<id>https://forum.yubico.com/viewtopic.php?t=753&amp;p=2933#p2933</id>
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<title type="html"><![CDATA[Re: OTP REPLAYED]]></title>

<content type="html" xml:base="https://forum.yubico.com/viewtopic.php?t=753&amp;p=2933#p2933"><![CDATA[
YubiKey device has some internal counters which along with other configured parameters are used to generate One Time Passwords (OTPs). These counters get updated on when a YubiKey is powered-up (inserted into a USB port) and for every YubiKey button touch.<br /><br />This counter information is also maintained on the server side and used for validating the YubiKey OTPs and updated for each OTP that is successfully validated.<br /><br />The details of Yubico OTP algorithm are described in details at: <!-- m --><a class="postlink" href="http://static.yubico.com/var/uploads/YubiKey_manual-2.0.pdf">http://static.yubico.com/var/uploads/Yu ... al-2.0.pdf</a><!-- m --><br /><br />Therefore it is not recommended to configure multiple YubiKeys with identical configuration.<br /><br />To address the situation if a user lost YubiKey, many applications allow assigning multiple YubiKeys to the same user account and some applications also offer interface for administrators/users to reassign new YubiKey(s) in case the original is lost.<br /><br />Thanks!<p>Statistics: Posted by <a href="https://forum.yubico.com/memberlist.php?mode=viewprofile&amp;u=1076">samir</a> — Fri Feb 24, 2012 3:22 pm</p><hr />
]]></content>
</entry>
<entry>
<author><name><![CDATA[valdez100]]></name></author>
<updated>2012-02-17T11:11:03+01:00</updated>
<published>2012-02-17T11:11:03+01:00</published>
<id>https://forum.yubico.com/viewtopic.php?t=753&amp;p=2922#p2922</id>
<link href="https://forum.yubico.com/viewtopic.php?t=753&amp;p=2922#p2922"/>
<title type="html"><![CDATA[OTP REPLAYED]]></title>

<content type="html" xml:base="https://forum.yubico.com/viewtopic.php?t=753&amp;p=2922#p2922"><![CDATA[
Hi<br />I upload new OTP configuration on slot1 of my yubikey taking down public &amp; private ID and my AES key and uploading it to yubico serves.Test replayed OK. Then i try to use the same credentias on the slot2. The purpose of this was to try if in case of lost of my yubikey I will be able to re-set my OTP on another yubikey. Unfortunately server returns OTP replayed login fail. What is wrong? Can't I use the same ID for one yubikey. Is it possible to make in batch mode for couples of yubikeys?<br />BR<p>Statistics: Posted by <a href="https://forum.yubico.com/memberlist.php?mode=viewprofile&amp;u=1961">valdez100</a> — Fri Feb 17, 2012 11:11 am</p><hr />
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