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From: Herbert Xu <herbert@gondor.apana.org.au>
To: "David S. Miller" <davem@redhat.com>
Cc: a.marsman@aYniK.com, alan@lxorguk.ukuu.org.uk,
	linux-kernel@vger.kernel.org
Subject: Re: 2.4.22-pre7: are security issues solved?
Date: Wed, 23 Jul 2003 20:47:53 +1000	[thread overview]
Message-ID: <20030723104753.GA2479@gondor.apana.org.au> (raw)
In-Reply-To: <20030723033505.145db6b8.davem@redhat.com>

On Wed, Jul 23, 2003 at 03:35:05AM -0700, David S. Miller wrote:
> 
> If I know your password is 7 characters I have a smaller
> space of passwords to search to just brute-force it.

It's much smaller if you didn't know that it was at most 7 characters
long.  However, if you did know the upper bound, or you were just
brute forcing all passwords starting from 1 character, then the
difference is relatively minor.  This is because

n + n^2 + n^3 + n^4 + n^5 + n^6

is much smaller than n^7 where n is something like 62 for a reasonable
password.

So if your password was broken using this method, then it's probably
too short anyway.
-- 
Debian GNU/Linux 3.0 is out! ( http://www.debian.org/ )
Email:  Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

  parent reply	other threads:[~2003-07-23 10:33 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-21 20:40 2.4.22-pre7: are security issues solved? Aschwin Marsman
2003-07-22  7:04 ` Marc-Christian Petersen
2003-07-22 15:02   ` Aschwin Marsman
2003-07-22 15:07     ` Marc-Christian Petersen
2003-07-22 17:01       ` Marcelo Tosatti
2003-07-23  9:56 ` Herbert Xu
2003-07-23 10:35   ` David S. Miller
2003-07-23 10:39     ` Herbert Xu
2003-07-23 10:48       ` David S. Miller
2003-07-23 10:47     ` Herbert Xu [this message]
2003-07-23 10:50       ` David S. Miller
2003-07-23 10:59         ` Herbert Xu
2003-07-23 20:16           ` Aurelien Jarno
2003-07-23 20:23             ` Alan Cox
2003-07-23 17:47       ` David Wagner
2003-07-23 11:57     ` Ville Herva
2003-07-23 17:50       ` David Wagner
2003-07-24  9:11     ` Florian Weimer
2003-07-23 12:56 John Bradford
2003-07-23 13:10 ` root
2003-07-23 14:08 John Bradford
2003-07-23 15:46 ` Aschwin Marsman

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