USE A PASSPHRASE WITH MORE THAN 20 CHARACTERS. Examples:
BAD: "vintage wine"
GOOD: "floor hiking dirt ocean"
(pick your own words, even longer is better)
FOR HIGH SECURITY, USE MORE THAN 32 CHARACTERS.
BACKGROUND:
Weakness in Passphrase Choice in WPA Interface
By Glenn Fleishman
By Robert Moskowitz
Senior Technical Director
ICSA Labs, a division of TruSecure Corp
<http://wifinetnews.com/archives/002452.html>
...
The offline PSK dictionary attack
...
Just about any 8-character string a user may select will be in the
dictionary. As the standard states, passphrases longer than 20 characters
are needed to start deterring attacks. This is considerably longer than
most people will be willing to use.
This offline attack should be easier to execute than the WEP attacks.
...
Using Random values for the PSK
The PSK MAY be a 256-bit (64 hexadecimal) random number. This is a large
number for human entry; 20 character passphrases are considered too long
for entry. Given the nature of the attack against the 4-Way Handshake, a
PSK with only 128 bits of security is really sufficient, and in fact
against current brute-strength attacks, 96 bits SHOULD be adequate. This is
still larger than a large passphrase ...
...
Summary
...
Pre-Shared Keying is provided in the standard to simplify deployments in
small, low risk, networks. The risk of using PSKs against internal attacks
is almost as bad as WEP. The risk of using passphrase based PSKs against
external attacks is greater than using WEP. Thus the only value PSK has is
if only truly random keys are used, or for deploy testing of basic WPA or
802.11i functions. PSK should ONLY be used if this is fully understood by
the deployers.
See also:
Passphrase Flaw Exposed in WPA Wireless Security
<http://www.technewsworld.com/story/32070.html>
Wi-Fi Protected Access. Security in pre-shared key mode
<http://en.wikipedia.org/wiki/Wi-Fi_Protected_Access>
"Chris Davies" <chris-usenet@roaima.co.uk> wrote in message
news:e0g1k6xsos.ln2@news.roaima.co.uk...
> John Navas <spamfilter1@navasgroup.com> wrote:
>> WPA-PSK is vulnerable to offline attack.
>
> Sigh. Why do you keep parroting the same old same old?
> Chris
Chris:
I really can't answer for him, but I appreciate it because I sort posts by
date. That way his information is within a week or 2 and easy to find. The
information is good and of value to those newbees that might be looking at
their security in their new set up. So, if you don't want to see the
information posted every so often, then simply kill file him, or the
subject. He makes that easy by keeping both the same user name and subject
name.
ALERT: WPA isn't necessarily secure 
Linear Mode
