<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body 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'>I’d like an option that removes or shrinks the DFNVerein PKI. <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><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><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"'> observatory-bounces@eff.org [mailto:observatory-bounces@eff.org] <b>On Behalf Of </b>Bernhard Amann<br><b>Sent:</b> Thursday, December 13, 2012 10:24 PM<br><b>To:</b> observatory@eff.org<br><b>Subject:</b> [SSL Observatory] The Trust Tree: An interactive graph of the CA ecosystem<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hi All,<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>We just released an interactive graph that shows the relationship<o:p></o:p></p></div><div><p class=MsoNormal>between the root-CAs of the Mozilla root-store and their intermediates <o:p></o:p></p></div><div><p class=MsoNormal>at <a href="http://notary.icsi.berkeley.edu/trust-tree/">http://notary.icsi.berkeley.edu/trust-tree/</a>. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Root-CAs are pictured as red nodes, intermediate CAs are green. <o:p></o:p></p></div><div><p class=MsoNormal>The node diameter scales logarithmically with the number of <o:p></o:p></p></div><div><p class=MsoNormal>certificates signed by the node. Similarly, the color of the green <o:p></o:p></p></div><div><p class=MsoNormal>nodes scales proportional to the diameter.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>The data source for this graph is the ICSI SSL notary [1], which was<o:p></o:p></p></div><div><p class=MsoNormal>previously mentioned on this mailing list. We have been passively <o:p></o:p></p></div><div><p class=MsoNormal>monitoring the Internet uplinks of a number of (mostly) edu<o:p></o:p></p></div><div><p class=MsoNormal>networks for certificate and SSL information for about 10 months.<o:p></o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Clicking on individual nodes reveals additional information about the <o:p></o:p></p></div><div><p class=MsoNormal>CAs, especially the number of valid child certificates we currently <o:p></o:p></p></div><div><p class=MsoNormal>know for it.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>In the graph, the CA that directly signed the largest number of certificates<o:p></o:p></p></div><div><p class=MsoNormal>is the Go Daddy Secure Certification Authority, an intermediate of <o:p></o:p></p></div><div><p class=MsoNormal>GoDaddy. Our current dataset contains over 74,000 certificates <o:p></o:p></p></div><div><p class=MsoNormal>that it signed.<o:p></o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>The DFN-Verein CA has signed the largest number of intermediate <o:p></o:p></p></div><div><p class=MsoNormal>CA certificates. As you might know it provides certificates for <o:p></o:p></p></div><div><p class=MsoNormal>many German higher education and research institutions. It creates <o:p></o:p></p></div><div><p class=MsoNormal>a unique sub-CA for each institution for which it issues certificates.<o:p></o:p></p></div><div><p class=MsoNormal>Our data set currently contains more than 200 sub-CAs of it.<o:p></o:p></p></div><div><p class=MsoNormal>The DFN does this for administrative reasons. The control of the<o:p></o:p></p></div><div><p class=MsoNormal>private keys of all sub-CAs remains at the DFN and they check<o:p></o:p></p></div><div><p class=MsoNormal>each certificate request.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div><div><p class=MsoNormal>If you have any questions or comments about this, please let us<o:p></o:p></p></div><div><p class=MsoNormal>know.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Bernhard<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>[1]: <a href="http://notary.icsi.berkeley.edu/trust-tree/">http://notary.icsi.berkeley.edu/</a><o:p></o:p></p></div></div></body></html>