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Re: [tor-talk] On the Theory of Remailers

Wooo thank's Tom ! First time using mailing lists, i'm going to like it :D
(and it's not a problem to answer from work :DD).
Ok, so i understand what you're meaning by high/low latency network.

Just, why don't apply this to web browsing ? Can't each node keep packet up
to 5 seconde based on random ? 5 second isn't a problem, as tor network is
already long to serve pages/packets.

From  my point of view, you can't allow some sort of different latency
paths for clients.
It will confuse basics users,
And power users will tweak this to allow only low latency circuits.

2013/1/9 Tom Ritter <tom@xxxxxxxxx>

> On 9 January 2013 10:05, Alexandre Guillioud
> <guillioud.alexandre@xxxxxxxxx> wrote:
> > Hi all,
> >
> > I'm reading your conversation, and i'm not understanding very well what
> you
> > mean by high/low latency network. Isn't it just a ping duration delta ?
> > You speak about low and high latency like it's a feature.
> >
> > Is tor mixing only low latency with low latency in its circuits ? Opening
> > for a dispatching of services (ie. mail on high latency, web on low ) ?
> >
> > What's the point ?
> Someone can probably explain it better by putting more time into it,
> but the gist of it is how long a mix node will 'hold onto' a message,
> before sending it on.  (Effectively 'mixing' it.)
> From the blog articles:
> > A 'Low Latency' mix network means as soon as a node receives a packet,
> it sends it out. A 'High Latency' mix network means a node will hold onto a
> message for some amount of time before sending it out.
> >
> > Traffic Analysis is a huge part of mix network design. If an attacker is
> watching the network (and we generally assume they are) - how much
> information do they gain by watching packet paths, sizes, and times, and
> how easy is it? If you see a network flow from Alice to Bob, and Bob to
> Charlie - those flows will probably be matchable. With regard to defending
> against Traffic Analysis, High Latency is preferable - being able to hold
> onto a packet for any length of time before sending it on gives you lot
> more options.
> >
> > Tor is a 'Low Latency' mix network - it has no choice because it's
> infeasible to browse the Internet with minute-long (or longer) delays
> during page loads. However, email can have delays - if an email doesn't
> arrive for 30 minutes or an hour, it's generally not a problem. So
> Remailers can afford to be a High Latency mix network. They will accumulate
> a number of messages in a pool, and then when the pool is a certain size,
> will send the messages out. There are multiple algorithms for pooling, and
> we'll go into more detail about them and pool attacks later.
> As a mix node, if I accumulate 8 same-size messages, and then send
> them all out at once to 8 recipients, you can't use traffic analysis
> to see who I sent which message out to - because they're
> indistinguishable.  That's high latency.  But if I had sent out each
> message as soon as I got it, you could see which message went to each
> recipient - that's low latency.
> -tom
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