[tor-dev] Proposal 274: Rotate onion keys less frequently

[Nick Mathewson]

On Sun, Feb 26, 2017 at 6:06 AM, teor <teor2345 at gmail.com> wrote:
>
>> On 25 Feb 2017, at 03:24, Nick Mathewson <nickm at torproject.org> wrote:
>>
>> Filename: 274-rotate-onion-keys-less.txt
>> Title: Rotate onion keys less frequently.
>> Author: Nick Mathewson
>> Created: 20-Feb-2017
>> Status: Open
>> Target: 0.3.1.x-alpha
>>
>> 1. Overview
>>
>>   This document proposes that, in order to limit the bandwidth needed
>>   for microdescriptor listing and transmission, we reduce the onion key
>>   rotation rate from the current value (7 days) to something closer to
>>   28 days.
>>
>>   Doing this will reduce the total microdescriptor download volume
>>   by approximately 70%.
>> ...
>
> Thanks for this, Nick!
>
> It seems sensible to me: a significant reduction in directory bandwidth
> for a minor decrease in forward secrecy.
>
> Proposal 277 deals with relays that appear to "rotate" onion keys very
> frequently (because they have multiple instances with the same identity
> key).
>
> But what about relays that don't rotate onion keys at all?
> https://trac.torproject.org/projects/tor/ticket/20055
>
> Should they be mentioned in this proposal, or is the ticket sufficient?
>

I think the ticket's fine -- though they could get mentioned in
proposal 277 too.

yrs,
-- 
Nick