From: Simon Josefsson <jas@extundo.com>
Cc: "(ding)" <ding@gnus.org>
Subject: Re: [ANNOUNCE] contrib/hashcash.el spam fighter
Date: Sun, 23 Jun 2002 19:59:30 +0200 [thread overview]
Message-ID: <ilu4rftzxj1.fsf@extundo.com> (raw)
In-Reply-To: <m3ptyif2di.fsf@peorth.gweep.net> (Stainless Steel Rat's message of "Sun, 23 Jun 2002 11:20:25 -0400")
Stainless Steel Rat <ratinox@peorth.gweep.net> writes:
> * Simon Josefsson <jas@extundo.com> on Sun, 23 Jun 2002
> | If you send mail to people that you know only accept mail with a
> | X-Hashcash: of a certain bit size,
>
> If I send mail to people that only accept mail with a X-Hashcash of a
> certain bit size, I can pick a hash out of a small table of pregenerated
> hashes of that size or larger, circumventing the "security" of the scheme.
Pregenerated or not, the computation of the field requires someone to
burn CPU time, if the limit is set sufficiently high spammers will
find it costs too much to send spam, which is the point.
I'm not saying it is a perfect scheme. Spamming is a social problem
and cannot be eliminated completely by technical means. But
experimenting with different technical solutions could perhaps
eventually improve the situation.
next prev parent reply other threads:[~2002-06-23 17:59 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-22 12:55 Simon Josefsson
2002-06-23 2:40 ` David Masterson
2002-06-23 4:39 ` Stainless Steel Rat
2002-06-23 5:12 ` David Masterson
2002-06-23 13:50 ` Stainless Steel Rat
2002-06-23 14:36 ` Simon Josefsson
2002-06-23 15:20 ` Stainless Steel Rat
2002-06-23 17:59 ` Simon Josefsson [this message]
2002-06-23 21:34 ` Stainless Steel Rat
2002-06-24 5:41 ` David Masterson
2002-06-24 8:20 ` Kai Großjohann
2002-06-24 12:06 ` Simon Josefsson
2002-06-24 16:05 ` Stainless Steel Rat
2002-06-24 16:41 ` Simon Josefsson
2002-06-24 19:26 ` Stainless Steel Rat
2002-06-24 21:14 ` Simon Josefsson
2002-06-25 1:55 ` Stainless Steel Rat
2002-06-25 2:15 ` Stainless Steel Rat
2002-06-25 8:56 ` Simon Josefsson
2002-06-25 14:54 ` Stainless Steel Rat
[not found] ` <mit.lcs.mail.ding/02Jun25.104630edt.119271@gateway.intersystems.com>
2002-06-28 14:48 ` Patrick J. LoPresti
2002-06-28 16:30 ` Stainless Steel Rat
[not found] ` <mit.lcs.mail.ding/02Jun28.122222edt.119118@gateway.intersystems.com>
2002-06-28 20:25 ` Patrick J. LoPresti
2002-06-28 21:30 ` Stainless Steel Rat
2002-06-28 23:03 ` Simon Josefsson
2002-06-29 0:41 ` Stainless Steel Rat
2002-06-29 11:46 ` Simon Josefsson
2002-06-29 13:56 ` Stainless Steel Rat
[not found] ` <m2u1nmti0u.fsf@tnuctip.rychter.com>
2002-06-29 14:05 ` Stainless Steel Rat
[not found] ` <mit.lcs.mail.ding/m3bs9uxjsh.fsf@peorth.gweep.net>
2002-06-30 0:20 ` Patrick J. LoPresti
2002-06-30 7:23 ` Stainless Steel Rat
[not found] ` <mit.lcs.mail.ding/02Jun28.172137edt.119392@gateway.intersystems.com>
2002-06-30 0:07 ` Patrick J. LoPresti
2002-06-30 7:48 ` Stainless Steel Rat
2002-07-01 6:37 ` Steinar Bang
2002-07-01 15:20 ` Stainless Steel Rat
2002-07-01 17:22 ` Steinar Bang
2002-07-01 18:37 ` Stainless Steel Rat
2002-07-02 10:43 ` Steinar Bang
2002-07-02 15:33 ` Stainless Steel Rat
2002-07-02 18:23 ` Simon Josefsson
2002-07-02 18:28 ` Karl Kleinpaste
2002-07-02 18:50 ` Simon Josefsson
2002-07-05 22:14 ` Kevin Ryde
2002-07-06 11:11 ` Henrik Enberg
2002-07-07 18:40 ` Simon Josefsson
2002-07-02 18:57 ` Steinar Bang
2002-07-02 21:09 ` Stainless Steel Rat
2002-07-03 11:45 ` Steinar Bang
2002-07-03 12:35 ` Oystein Viggen
2002-07-03 14:49 ` Stainless Steel Rat
2002-06-25 6:57 ` undo mail catchup w .snapshot .[mumble]rc ? Yeoh Yiu
2002-06-26 19:33 ` Paul Jarc
2002-06-28 4:51 ` Yeoh Yiu
2002-06-23 14:36 ` [ANNOUNCE] contrib/hashcash.el spam fighter Mark Milhollan
2002-06-23 10:54 ` Simon Josefsson
2002-06-24 18:22 ` Jason R. Mastaler
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