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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Now im liking it.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>By default, openid can have null protection on its master secret
(proposed by OP, it looks like, RSA like), when there is a bearer known as SSL.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Session type X agreed between RP#1 and OP#1 can perhaps be
leveraging the internals of an SSL ciphersuite, to perhaps have a KDF applied
to the master secret for the new record layer protocol. Others have done this
(in connectionless SSL over UDP, for discovery of routers/firewall management
ports).<o:p></o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
general-bounces@openid.net [mailto:general-bounces@openid.net] <b>On Behalf Of </b>Andrew
Arnott<br>
<b>Sent:</b> Thursday, March 19, 2009 11:39 AM<br>
<b>To:</b> Allen Tom<br>
<b>Cc:</b> Martin Atkins; OpenID List<br>
<b>Subject:</b> Re: [OpenID] D-H vs SSL<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Well, the spec allows for session types to be implemented
that are not defined in the spec. If DH is ever removed from the OpenID
spec, I hope the spec can reference another DH spec that keeps it alive as a
spec that people can optionally implement.<o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><br clear=all>
--<br>
Andrew Arnott<br>
"I [may] not agree with what you have to say, but I'll defend to the death
your right to say it." - Voltaire<br>
<br>
<o:p></o:p></p>
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<p class=MsoNormal>2009/3/19 Allen Tom <<a href="mailto:atom@yahoo-inc.com">atom@yahoo-inc.com</a>><o:p></o:p></p>
<div>
<p class=MsoNormal>If we consider OAuth's secret exchange mechanism for
HMAC-SHA1 sigs,<o:p></o:p></p>
<ul type=disc>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l0 level1 lfo1'>OAuth Service Providers usually issue a Consumer
Secret to the developer, without any input from the developer. (hopefully
via HTTPS)<o:p></o:p></li>
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
mso-list:l0 level1 lfo1'>OAuth Request Token and Access Token secrets are
issued by the Service Provider to the Consumer (also, hopefully via HTTPS),
without any input from the Consumer<o:p></o:p></li>
</ul>
<p class=MsoNormal>Returning cleartext secrets via HTTPS would be consistent
with OAuth.<br>
<br>
Although DH on top of SSL is safer than cleartext and SSL, is the overhead of
having the spec discuss DH worth it? If the OP is unable to generate a strong
secret on its own, or if the transport layer between the RP and OP cannot be
secured using HTTPS, then arguably the entire system has issues.<br>
<br>
I only mention DH, not because I have an issue with DH, but because one of
OpenID's most desirable traits is its relative simplicity. The spec is pretty
straightforward, and it's not all that hard to implement. Sites that want a
richer (and more complicated) SSO protocol standard have alternatives that are
already in production and are widely used.<br>
<span style='color:#888888'><br>
Allen</span><o:p></o:p></p>
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<p class=MsoNormal><br>
<br>
Ben Laurie wrote:<br>
<br>
<o:p></o:p></p>
<pre>Ah. I see.<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>So, I am going to be lazy, because I have not checked the spec, but<o:p></o:p></pre><pre>its considered good practice when establishing a shared secret for<o:p></o:p></pre><pre>both sides to contribute to that secret. Is that true for the<o:p></o:p></pre><pre>cleartext secret?<o:p></o:p></pre><pre><o:p> </o:p></pre><pre> <o:p></o:p></pre></div>
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<p class=MsoNormal style='margin-bottom:12.0pt'><br>
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<a href="http://openid.net/mailman/listinfo/general" target="_blank">http://openid.net/mailman/listinfo/general</a><o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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