full-disclosure - Re: WiFi is no longer a viable secure connection

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Date: Sat, 11 Oct 2008 02:36:15 +0200
From: Cedric Blancher <blancher@...tel-securite.fr>
To: "Ivan ." <ivanhec@...il.com>
Cc: Full-Disclosure mailing list <full-disclosure@...ts.grok.org.uk>
Subject: Re: WiFi is no longer a viable secure connection

Le samedi 11 octobre 2008 à 11:03 +1100, Ivan . a écrit :
> Global Secure Systems has said that a Russian's firm's use of the
> latest NVidia graphics cards to accelerate WiFi 'password recovery'
> times by up to an astonishing 10,000 per cent proves that WiFi's WPA
> and WPA2 encryption systems are no longer enough to protect wireless
> data.

No kinding ?! 100 times what a CPU can do[1] ?! Whaooo.

But what are they referring to saying "up to 100 times faster than by
using CPU only" ? We don't know. On, fast CPU, Aircrack cracking speed
can go up to around 650/700 psk/s. By 100, it means 65k/70k psk/s. Let's
round it to 100k psk/s.

Now, do the maths. A PSK is a least 8 ASCII printable chars between
codes 32 and 126. I let you figure how much time you will need to cover
the minimum length (8 chars) key space.

We covered the subject at BA-Con. We can reach 12k psk/s on a single
GTX280 alone[2]. That's only a factor 5 to 6 behind, without any
brilliant optimisation.

I don't see any breakthrough here that could make WPA/WPA2 PSK
inefficient. Really. Need something like a real crypto attack, or real
computation power boost, like reaching 10M/s.

[1] http://www.elcomsoft.com/news/268.html
[2] http://sid.rstack.org/pres/0810_BACon_WPA2_en.pdf

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