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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><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'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> public-bounces@cabforum.org [mailto:public-bounces@cabforum.org] <b>On Behalf Of </b>Eddy Nigg<br><b>Sent:</b> Friday, October 31, 2014 5:55 PM<br><br></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On 10/31/2014 07:09 PM, Jeremy Rowley wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre>7) Short-lived certs provide a limited hard-fail since the expiration message for expired certs is more visible than the message received where revocation information is unavailable<o:p></o:p></pre></blockquote><p class=MsoNormal><br>I don't agree with this entirely - a working revocation BLOCKS a visitor to the site usually, whereas an expiration notice is not only clicked away, from the logic of a visitor it's "just" an expiration. Meaning that this site had a valid certificate and just failed to renew or whatever.<br><br>In my opinion browser would have to implement a similar logic as with revocations when a short-lived certificate is expired in order to be effective. And I highly doubt that neither CAs nor browser wish to do that.<span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><b><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>[RWS] +100 Expiration and revocation are NOT equivalent under current browser behavior.<o:p></o:p></span></i></b></p><p class=MsoNormal><br><br><br><o:p></o:p></p><pre>8) Browsers don't need to add the certs to their CRLSets or do a call to the CA to retrieve revocation information.<o:p></o:p></pre><p class=MsoNormal><br>With the above logic, this isn't necessarily true if a key of such certificates gets compromised. Such a key could be potentially used for hundreds of certificates, depending on what the guidelines will be for reuse of such keys. <br><br>If the weakness of how browsers handle expired certificates will be abused with such certificates, they might have to be included in a CRL.<br><br><br><o:p></o:p></p><pre>9) Short-lived certs provide shorter revocation windows than currently offered under the BRs.<o:p></o:p></pre><p class=MsoNormal style='margin-bottom:12.0pt'><br>Please note that the BR allows for a maximum period. CAs might use shorter periods in addition that certain browsers don't hold OCSP responses for more than 24 hours.<o:p></o:p></p><div><p class=MsoNormal>-- <o:p></o:p></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0><tr><td colspan=2 style='padding:0in 0in 0in 0in'><p class=MsoNormal>Regards <o:p></o:p></p></td></tr><tr><td colspan=2 style='padding:0in 0in 0in 0in'><p class=MsoNormal> <o:p></o:p></p></td></tr><tr><td style='padding:0in 0in 0in 0in'><p class=MsoNormal>Signer: <o:p></o:p></p></td><td style='padding:0in 0in 0in 0in'><p class=MsoNormal>Eddy Nigg, COO/CTO<o:p></o:p></p></td></tr><tr><td style='padding:0in 0in 0in 0in'><p class=MsoNormal> <o:p></o:p></p></td><td style='padding:0in 0in 0in 0in'><p class=MsoNormal><a href="http://www.startcom.org">StartCom Ltd.</a><o:p></o:p></p></td></tr><tr><td style='padding:0in 0in 0in 0in'><p class=MsoNormal>XMPP: <o:p></o:p></p></td><td style='padding:0in 0in 0in 0in'><p class=MsoNormal><a href="xmpp:startcom@startcom.org">startcom@startcom.org</a><o:p></o:p></p></td></tr><tr><td style='padding:0in 0in 0in 0in'><p class=MsoNormal>Blog: <o:p></o:p></p></td><td style='padding:0in 0in 0in 0in'><p class=MsoNormal><a href="http://blog.startcom.org">Join the Revolution!</a><o:p></o:p></p></td></tr><tr><td style='padding:0in 0in 0in 0in'><p class=MsoNormal>Twitter: <o:p></o:p></p></td><td style='padding:0in 0in 0in 0in'><p class=MsoNormal><a href="http://twitter.com/eddy_nigg">Follow Me</a><o:p></o:p></p></td></tr><tr><td colspan=2 style='padding:0in 0in 0in 0in'><p class=MsoNormal> <o:p></o:p></p></td></tr></table><p class=MsoNormal><span style='color:windowtext'><o:p> </o:p></span></p></div></div></div></body></html>