<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">A while ago, I proposed a new form of ‘strong email address’ that combined a PGP fingerprint like identifier with an email address:<div class=""><br class=""></div><div class="">
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<!--StartFragment--><span style="line-height: 107%; font-family: Calibri;" class="">MB2GK-6DUF5-YGYYL-JNY5E?<a href="mailto:alice@example.com" class="">alice@example.com</a></span></div><div class=""><br class=""></div><div class="">The idea of this scheme is that <span style="font-family: Calibri; font-size: 11pt;" class="">MB2GK-6DUF5-YGYYL-JNY5E</span> is the fingerprint of a key under which a policy for sending mail to <a href="mailto:alice@example.com" class="">alice@example.com</a> is signed. That might have statements like ‘emails must be signed’, ‘use PGP’, etc.</div><div class=""><br class=""></div><div class="">Note that as with Tor, merely having the address does not mean that you can use it. But that is what we want.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">The Tor scheme is better in some ways.</div><div class=""><br class=""></div><div class=""><a href="mailto:alice@example.com.mb2gk-6duf5-ygyyl-jny5e.onion" class="">alice@example.com.MB2GK-6DUF5-YGYYL-JNY5E.onion</a></div><div class=""><br class=""></div><div class="">But the .onion means Tor and I don’t want to have .openpgp, .smime etc. It would not work. </div><div class=""><br class=""></div><div class="">I have a better idea:</div><div class=""><br class=""></div><div class="">alice@example.com.MB2GK-6DUF5-YGYYL-JNY5E</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">There is no need for a suffix at all. The probability of an accidental collision here is 2^92 and we can use a variety of techniques (e.g. work hardening) to increase the work factor. We can even pile on more characters if need be.</div><div class=""><br class=""></div><div class="">No need for permission from ICANN either. Their US government mandate expires in a few months and I don’t recognize their new one.</div><div class=""><br class=""></div><div class="">From a deployment perspective, we can (and should) allow clients to retrieve policies from their trusted DNS server by simply adding a line to the effect that if the TLD is more than 24 characters long, interpret it as a UDF key fingerprint.</div><div class=""><br class=""></div><div class="">The new strong DNS addresses are compatible with pretty much every existing email client. Just route the inbound and outbound email through a proxy that strips off fingerprints from strong email addresses, fetches the policy and acts accordingly. Users can compose and read email just like normal. The only difference being that their email is now encrypted end to end (but not in client storage).</div><div class=""><br class=""></div><div class="">Yes, a proper client that does this native is better but only if the product is done really-right rather than botched and bungled user experience that Microsoft, Apple and Thunderbird offer. I greatly appreciate the heroic efforts of people writing plug ins but having written some myself I don’t think that is a viable model to produce world class user experience. The base applications are just too buggy.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">The chief security issue here is that if we are talking about <a href="mailto:alice@eop.gov" class="">alice@eop.gov</a> or <a href="mailto:alice@microsoft.com" class="">alice@microsoft.com</a> or the like, we want to make sure that we are talking to the implied domain if it matters. Which is something that enterprises can do with an appropriate CAA record requiring messages to that domain be supported by a suitably validated cert.</div><div class=""><br class=""></div></body></html>