Re: [tor-talk] NSA supercomputer

[Alexandre Guillioud <guillioud.alexandre@xxxxxxxxx>]

My guess is that the Key size is configured right into the node's source
code.
If you apply multiple key size accross the network, you're exposed with the
smallest encryption key of the circuit.
Except for one thing : if somebody can break one of the circuit's key,
depending of the node number into the circuit, he can be able to read your
message. But without a timing attack or an attack on all the circuit's keys
(destination/from adresses datas are encapsulated one into another), he
can't know the entry, exit node or target adresses at the same time.

I'm a begginer here, don't take my words for truth ;)


Le jeudi 4 avril 2013, Bernard Tyers a écrit :

> That's what I was thinking, I just didn't know if there was another
> reasons.
>
> I guess the key size is configured on the Tor node? I haven't found it
> anywhere in the configuration (I'm using TBB on OS X).
>
> Is it possible to increase the size of the key, if say I've got a big
> server running as a node?
>
> If there are nodes using different length keys, is the security relying on
> the node with the smallest key length?
>
> Thanks.
>
> Bernard
>
> ----
> Written on my small electric gadget. Please excuse brevity and (possible)
> misspelling.
>
> Alexandre Guillioud <guillioud.alexandre@xxxxxxxxx> wrote:
>
> >The bigger the key is, the longer (cpu cycle) it take to encrypt/decrypt ?
> >
> >Le jeudi 4 avril 2013, Bernard Tyers a écrit :
> >
> >> Hi,
> >>
> >> Is there a reason 1024 bit keys, instead of something higher is not
> used?
> >> Do higher bit keys affect host performance, or network latency?
> >>
> >>
> >> Thanks,
> >> Bernard
> >>
> >>
> >> ----
> >> Written on my small electric gadget. Please excuse brevity and
> (probable)
> >> misspelling.
> >>
> >> George Torwell <bpmcontrol@xxxxxxxxx <javascript:;>> wrote:
> >>
> >> a second guess would be going after 1024 bit keys.
> >> there is also a video on youtube from a recent con about the
> feasibility of
> >> factoring them, <"fast hacks" or something like that> at the end, jacob
> >> applebaum asks about it and they advise him to use longer keys or
> elliptic
> >> curves crypto.
> >>
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