<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 21 Nov 2015, at 04:14, Michael Rogers <<a href="mailto:michael@briarproject.org" class="">michael@briarproject.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">On 20/11/15 16:24, David Goulet wrote:<br class=""><blockquote type="cite" class=""> # Consensus<br class=""> (This goes for both previous and current SRV)<br class=""> if SRV in consensus:<br class=""> dirauth MUST keep it even if the one they have doesn't match.<br class=""> Majority has decided what should be used.<br class=""> else:<br class=""> dirauth MUST discard the SRV it has.<br class=""></blockquote><br class="">This seems like an excellent idea. Relying on the consensus ensures that<br class="">no matter what crazy shit happens to the individual dirauths, they can<br class="">eventually converge on the same previous and current SRV values (or<br class="">agree that no such SRV values exist) by sharing the valid consensus<br class="">documents they've seen.<br class=""><br class=""><blockquote type="cite" class="">Side effect of only keeping SRV that are in the consensus. If one voting<br class="">round goes bad for X reason and consensus end up with no SRV, we end up<br class="">in bootstrapping mode that is no previous nor current SRV in the<br class="">consensus which is problematic because for 48 hours, we won't have a<br class="">previous SRV which is the one used by everyone.<br class=""><br class="">I don't see a way to get out of this because consensus is decided from<br class="">the votes deterministically thus if not enough vote for SR values, we'll<br class="">end up with a consensus with none so this is why client/HS have to<br class="">fallback to a disaster value by themselves I think which can NOT be<br class="">based on the previous SRV.<br class=""></blockquote><br class="">If there's no consensus on a fresh SRV for a while, clients and relays<br class="">can keep producing emergency SRVs by hashing the last fresh SRV they<br class="">know about, right? It doesn't have to be yesterday's SRV - if the last<br class="">fresh SRV was produced a week ago, they keep hashing based on that<br class="">(which is not ideal of course). As above, using the consensus seems like<br class="">a good idea because it allows the network to converge on the same values<br class="">just by sharing valid consensus documents.<br class=""></div></div></blockquote><br class=""></div><div>If there's no consensus on a fresh SRV, why not just use the disaster recovery procedure?</div><div><br class=""></div><div>That is:</div><div><br class=""></div><div> # Consensus<br class=""> if majority agrees on SR value(s):<br class=""> put in consensus<br class=""> else:<br class=""> put disaster recovery SR value (based on last round's agreed SR value, if any) in consensus<br class=""><br class=""> Output: consensus is created<br class=""><br class=""> (Proceed like the 16:00 period)</div><div><br class=""></div><div>That way, clients and relays don't need to do anything special: there will always be a SRV in the consensus.</div><div><br class=""></div><div>This means that the SR consensus method will always produce a SR value, which I believe is a much better property than occasionally failing to produce a value.</div><div><br class=""></div><div>Tim</div><div><br class=""></div><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; 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white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Tim Wilson-Brown (teor)</div><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""></div><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">teor2345 at gmail dot com<br class="">PGP 968F094B<br class=""><br class="">teor at blah dot im<br class="">OTR CAD08081 9755866D 89E2A06F E3558B7F B5A9D14F</div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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