full-disclosure - Re: НА: WPA attack improved to 1min, MITM

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Date: Wed, 26 Aug 2009 11:22:10 -0700
From: Tim <tim-security@...tinelchicken.org>
To: "M\.B\.Jr\." <marcio.barbado@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: 
	НА: WPA attack improved to 1min, MITM

> Rijndael (AES) is a symmetric block cipher. Why WPA2 uses symmetric
> cryptography in a communication (which is an asymmetric situation)?

In what way do you mean it is asymmetric?  CCMP can be used with
preshared keys.  Even if authentication were using asymmetric
algorithms, have you looked at any real-world crypto protocols that
use public keys for authentication?  They pretty much all use
symmetric ciphers for encryption after agreeing on a session key, so
this isn't unusual.  As another poster mentioned, the primary reason
for this is performance.

tim

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