From: Emanuel Berg via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: Re: Noob dumb question (extending emacs)
Date: Fri, 22 Oct 2021 21:26:02 +0200 [thread overview]
Message-ID: <87bl3goo8l.fsf@zoho.eu> (raw)
In-Reply-To: YXL5eHBoqzXRuuva@protected.localdomain
Jean Louis wrote:
> Out of 4540 passwords maintained in my computer and demands
> by websites, I can conclude that passwords shall:
>
> - be very random, not similar to any dictionary words
Right, since a brute force attack would (1) iterate such
existing dictionaries and those are a small subset of all
possible passwords, yet if allowed, people would still use
them, and more often so than any (to a human) meaningless
combination of chars, so not only would it (2) decrease the
search space, it would (3) increase the likelihood of a hit in
that, already diminished space ...
That is, it will be easier to carry out a brute force attack
(point 1), and the likelihood of success will increase (points
2 and 3).
Technically the search space wouldn't be decreased, on the
contrary by disallowing such words, THAT will decrease it, but
because of human behavior ... its a decrease that will be
an increase!
> - have mixture of upper and lower letters;
> - include some numbers;
> - include special symbols like & or %
Well, this will increase the search space size. But just
because it looks more cr%pt1C to a human doesn't mean it is
necessarily more difficult for a computer since it will just
iterate all possible chars ... However the bigger the space ->
the more attempts -> the more computing power and/or time will
be necessary.
The search space size is easy enough to calculate, if the
allowed alphabet (chars) are A = {a ... o} and the min
password length is n and the max is m (so n <= m), then the
number of combinations, i.e. the search space size, would be
... |A|**n + ... + |A|**i + ... + |A|**m for all integers
i that are n < i < m (and including the endpoints n and m,
this can be put in math using the big sigma, for summation,
and below it, initialization, here i = n, above it, where the
loop stops if you will, here m, yes inclusive).
The math behind it is called combinatorics and is a branch of
math that is very easy to a programmer's mind I'd say :) (I
hope I won't regret having said that :P)
Now, if one doesn't rely on passwords at all, the brute force
attack guess it won't ever succeed ...
--
underground experts united
https://dataswamp.org/~incal
next prev parent reply other threads:[~2021-10-22 19:26 UTC|newest]
Thread overview: 127+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-19 22:12 Noob dumb question (extending emacs) Ivano Da Milano
2021-10-20 0:36 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-20 6:34 ` Marcin Borkowski
2021-10-20 18:13 ` H. Dieter Wilhelm
2021-10-20 6:53 ` Jean Louis
2021-10-20 8:23 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-20 17:10 ` Ivano Da Milano
2021-10-20 18:41 ` Tassilo Horn
2021-10-20 18:56 ` Ken Goldman
2021-10-20 19:01 ` Ivano Da Milano
2021-10-20 19:45 ` Jean Louis
2021-10-21 5:27 ` Ivano Da Milano
2021-10-21 7:40 ` H. Dieter Wilhelm
2021-10-21 15:46 ` Ivano Da Milano
2021-10-21 16:03 ` H. Dieter Wilhelm
2021-10-21 17:49 ` Ivano Da Milano
2021-10-21 18:51 ` Jean Louis
2021-10-21 20:02 ` H. Dieter Wilhelm
2021-10-21 22:58 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-22 6:59 ` H. Dieter Wilhelm
2021-10-22 12:18 ` Jean Louis
2021-10-22 12:56 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-22 13:14 ` Yuri Khan
2021-10-22 17:51 ` Jean Louis
2021-10-22 18:50 ` Yuri Khan
2021-10-22 19:29 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-22 21:22 ` Jean Louis
2021-10-23 18:08 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-24 7:10 ` Jean Louis
2021-10-24 9:35 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-24 17:41 ` Jean Louis
2021-10-24 18:20 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-25 5:47 ` Jean Louis
2021-10-25 9:40 ` Yuri Khan
2021-10-25 10:23 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-25 12:41 ` Jean Louis
2021-10-25 19:22 ` Jean Louis
2021-10-25 19:46 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-25 19:52 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-25 19:56 ` About randomity, entropy, random passwords - was " Jean Louis
2021-10-25 20:29 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-25 20:00 ` Jean Louis
2021-10-25 19:56 ` Yuri Khan
2021-10-25 20:24 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-25 20:34 ` Jean Louis
2021-10-25 20:29 ` About randomity, entropy, random passwords - was " Jean Louis
2021-10-28 20:39 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-23 8:41 ` Michael Heerdegen
2021-10-23 10:16 ` Yuri Khan
2021-10-23 10:46 ` Michael Heerdegen
2021-10-23 18:27 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-24 8:16 ` Michael Heerdegen
2021-10-28 2:24 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-28 11:41 ` Michael Heerdegen
2021-10-28 12:07 ` tomas
2021-10-28 20:56 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-28 22:54 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-31 20:46 ` Michael Heerdegen
2021-11-01 2:09 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-11-01 19:38 ` Michael Heerdegen
2021-11-03 1:06 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-11-03 21:24 ` Michael Heerdegen
2021-11-03 22:16 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-11-05 19:03 ` Jean Louis
2021-11-05 21:50 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-31 20:42 ` Michael Heerdegen
2021-11-05 18:59 ` Jean Louis
2021-10-23 12:54 ` Michael Heerdegen
2021-10-23 13:07 ` Yuri Khan
2021-10-23 18:41 ` ERC links to man pages (was: Re: Noob dumb question (extending emacs)) Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-24 7:08 ` Noob dumb question (extending emacs) Jean Louis
2021-10-24 8:57 ` Michael Heerdegen
2021-10-24 17:59 ` Jean Louis
2021-10-25 9:18 ` Michael Heerdegen
2021-10-25 9:33 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-25 19:44 ` Jean Louis
2021-10-25 20:20 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-25 20:33 ` Jean Louis
2021-10-25 12:45 ` Jean Louis
2021-10-25 13:20 ` Michael Heerdegen
2021-10-25 19:54 ` About randomity, entropy, random passwords - was " Jean Louis
[not found] ` <YXcLIC+doASdNFll@protected.localdomain>
[not found] ` <87cznryfnz.fsf@web.de>
2021-10-26 18:52 ` Jean Louis
2021-10-23 18:22 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-23 19:52 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-24 6:43 ` Jean Louis
2021-10-24 8:28 ` Michael Heerdegen
2021-10-24 18:03 ` Jean Louis
2021-10-24 9:31 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-24 18:09 ` Jean Louis
2021-10-24 18:30 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-25 5:31 ` Jean Louis
2021-10-28 2:33 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-11-05 19:09 ` Passwords -- " Jean Louis
2021-11-05 22:00 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-23 18:17 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-24 8:42 ` Michael Heerdegen
2021-10-22 18:55 ` Yuri Khan
2021-10-22 19:30 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-22 21:31 ` Jean Louis
2021-10-22 22:21 ` H. Dieter Wilhelm
2021-10-23 10:46 ` Yuri Khan
2021-10-23 18:13 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-24 7:48 ` Yuri Khan
2021-10-24 9:37 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-24 6:45 ` Jean Louis
2021-10-24 8:50 ` Michael Heerdegen
2021-10-24 17:20 ` Jean Louis
2021-10-24 18:17 ` Yuri Khan
2021-10-24 19:07 ` Jean Louis
2021-10-24 19:05 ` Jean Louis
2021-10-25 0:12 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-25 3:54 ` Jean Louis
2021-10-22 18:57 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-22 18:53 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-22 17:48 ` Jean Louis
2021-10-22 19:26 ` Emanuel Berg via Users list for the GNU Emacs text editor [this message]
2021-10-21 19:45 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-20 4:04 ` Ivano Da Milano
2021-10-20 5:46 ` H. Dieter Wilhelm
2021-10-20 5:58 ` Emanuel Berg via Users list for the GNU Emacs text editor
[not found] ` <CAPWV0kyjr0=FrkVkH+Wf573fddX3pM4iiEfkQJ6oe1J_pQuNPA@mail.gmail.com>
[not found] ` <86a6j3wo7y.fsf@duenenhof-wilhelm.de>
[not found] ` <CAPWV0kyogB+u0X4dUhpyEox6pih1MJkjE2e_OoqQoP81NZceHQ@mail.gmail.com>
2021-10-20 18:31 ` Fwd: " Ivano Da Milano
2021-10-20 6:50 ` Jean Louis
2021-10-20 8:20 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-20 14:13 ` Jean Louis
2021-10-21 19:56 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-10-23 10:51 ` Tassilo Horn
2021-10-23 18:36 ` Emanuel Berg via Users list for the GNU Emacs text editor
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