Comments (5)
If the router must calculate DH exchange on every request, the speed won't be
too high, since calculating modular exponentation with 1.5 kbit modulus is too
heavy work for poor router's CPU that it can calculate tens or hundreds of them
in a second.
Original comment by [email protected]
on 2 Jan 2012 at 6:28
from reaver-wps.
We've attempted parallel attacks, but we run into two problems:
1) Multiple simultaneous WPS registrars conflict with each other in the AP's
internal WPS state machine and neither attack gets anywhere.
2) For devices where #1 is not an issue, you still don't get significant speed
improvements due to the low resources available on the AP.
We are looking at using the improved DH attack that Stefan proposed in his
paper, which we currently don't implement. This should lower the seconds/pin
attempt by about .5 to 1 second per attempt.
Original comment by [email protected]
on 2 Jan 2012 at 1:33
- Changed state: WontFix
from reaver-wps.
I haven't found how to set issue type so can you set it to enhancement for me?
Do users notify AP speeddown when bruteforce is in action (e.g. the router is
lagging)?
I wonder how sending low public ephemeral value should significally speed up
modular exponentation since calculation time mostly depends on modulus length
and power length. So have you got 50% speedup on your tests?
Is it possible to test several pins after one DH exchange?
Original comment by [email protected]
on 3 Jan 2012 at 1:55
from reaver-wps.
This issue has been closed, as parallelizing is not really a viable method of
speeding up this attack.
The lockout is done automatically by some APs. Legitimate users should not
notice any lag, there is actually very little traffic sent between the AP and
Reaver.
I have not done any tests with Stefan's suggested speed ups, but his code tests
pins much faster than mine. Here is his explanation: "Speed optimization for DH
KE: If Alice uses secret '0' A=2^0=1 then Bob (AP) calculates shared Key A^b =
1^b = 1 -> no sq&multiply needed." Basically he's lowering the amount of math
the AP has to do since most of them have very limited resources, no MMU, etc.
You can only test one pin after each DH exchange.
Original comment by [email protected]
on 3 Jan 2012 at 2:37
from reaver-wps.
Proper issue type should be good even if it's closed.
If there is no lockdown, the bottleneck is AP's CPU and the user can somehow
notify that CPU load is constantly 100%. Traffic doesnt matter in this case.
Yeah, just forgot about 1. Square/multiply/montgomery reduction will still be
calculated, but speedup for square & multiply will be (1536/size(int))^2, since
to multiply 2 big integers you only need multiplying 1 int with 1 int instead
of amount of ints in modulus with itself. How much faster is his tool against
your, 50%?
>You can only test one pin after each DH exchange.
This sux :)
Original comment by [email protected]
on 3 Jan 2012 at 1:41
from reaver-wps.
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