Re: Cracking preshared keys

[Stefan Laudat <stefan () worldbank ro>]

> I find your recommendations hard to take seriously.  This is not a
> vulnerability in IPSec, a good reason to disable vpn access, or anything
> like that.  Just use some common sense in how you use the crypto.  If you
> must use pre-shared keys, choose strong keys; or, use public keys instead
> of pre-shared keying.  Surely you agree?

Third option: there are some IPSEC implementations (such as
Linksys' BEFVP41 vpn router) which blacklist the attacker's IP
for a given amount of time when wrong PSK count overpasses
a threshold. It takes an eternity to try many combinations though :)

just my .02 eurocents

-- 
Stefan Laudat
CCNA & CCAI
-------------
Marriage is the only adventure open to the cowardly.
                -- Voltaire