minion-design.pdf / low bandwidth high latency long term connections

[jamesd at echeque.com]

On 2019-10-22 10:03, Zenaan Harkness wrote:
> On Mon, Oct 21, 2019 at 06:58:57PM -0300, Punk - Stasi 2.0 wrote:
>>
>> 	courtesy of tor scum dingledine and matheson and a GCHQ guy, danezis who now works for facebook-NSA as well. Wait, facebook, nsa, gchq, university of london, etc so many aliases for the same mafia.
>>
>>
>> 	anyway :  https://www.mixminion.net/minion-design.pdf
> 
> Have not begun to read that yet, but one of the stream covfefe will
> "recommend as a default for all users" is a really low bandwidth
> ("bw") and high latency, permanent connection.
> 
> 1KiB/s is much too fat, and at 80MiB/day (2.4GiB per month) folks
> will complain.
> 
> But let's consider just 512 bytes every 10 minutes (a single small
> UDP packet):
> 
>    1 * 6 * 24 * 30 ~= up to 4320 separate "message sends" per month
> 
>    each message send can contain up to 512 / 128 = 4 "std tweets"
>    therefore 17,280 "std tweets" at 10 minute latency
> 
>    at 512 * 6 * 24 * 30 ~= 2.1 MiB bandwidth per month

But you want to tweet to everyone, or everyone who is subscribing to 
your tweets, or to everyone a group.

So assume every participant is subscribed to various groups, and flood 
fills the data around throughout all members of the group, and all 
members subscribed to that particular poster.

Well, most people will not be posting every ten minutes, but a typical 
message will contain the hashes summarizing the previous state of the 
groups at the previous multiple of 2^15 seconds, plus a bloom filter for 
the messages since then.  And if you have a bunch of groups, and a bunch 
of people you are subscribed to, it is going to add up.