From: Manoj Srivastava <srivasta@ieee.org>
To: emacs-devel@gnu.org
Cc: ding@gnus.org
Subject: Re: New Emacs facilities from Gnus
Date: Sun, 04 Nov 2007 14:36:33 -0600 [thread overview]
Message-ID: <873avlsq7i.fsf@anzu.internal.golden-gryphon.com> (raw)
In-Reply-To: E1IolaS-0005XD-0Q@fencepost.gnu.org
Hi,
On Sun, 04 Nov 2007 14:56:48 -0500, Richard Stallman <rms@gnu.org> said:
> ;;; hashcash.el --- Add hashcash payments to email
> ;; Maintainer: Paul Foley <mycroft@actrix.gen.nz>
> What does this do? What are hashcash payments?
This is a device used for fighting Spam. The sender creates a
header in the outgoing mail for each recipient; this hash is
computationally expensive to create, but easy to veryfy, asnd the
string used as input contain the destination address and a timestamp,
so it is not easy to reuse.
Popular Spam prevention software like spamassassin verifies the
hash, and if successful, scores the mail as not Spam. It also creates a
store of hashcash numbers found to prevent replay attacks.
So, as a sender, I have my computer spend a few seconds while
sending out mail in return for a higher likelyhood that my email does
not end up in the spam filter.
The example given on the hashcash page is:
% echo -n 0:030626:adam@cypherspace.org:6470e06d773e05a8 | sha1
00000000c70db7389f241b8f441fcf068aead3f0
This is a hashcash created for adam@cypherspace.org on
03/06/26, which has an 32-bit collision with the all 0 string.
> Will this work with sendmail.el and rmail.el?
It does work with sendmail.el, as far as I can tell.
manoj
http://www.hashcash.org/faq/
--
It's not that I'm afraid to die. I just don't want to be there when it
happens. Woody Allen
Manoj Srivastava <srivasta@acm.org> <http://www.golden-gryphon.com/>
1024D/BF24424C print 4966 F272 D093 B493 410B 924B 21BA DABB BF24 424C
next prev parent reply other threads:[~2007-11-04 20:36 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-28 9:20 Gnus in Emacs is updated to No Gnus 0.7 Miles Bader
2007-10-28 9:46 ` Leo
2007-10-28 9:58 ` Miles Bader
2007-10-28 14:25 ` Reiner Steib
2007-10-28 14:49 ` Leo
2007-10-28 15:07 ` Miles Bader
2007-10-28 15:57 ` Reiner Steib
2007-10-29 7:50 ` Glenn Morris
2007-10-29 19:26 ` Reiner Steib
2007-10-29 2:56 ` Daiki Ueno
2007-10-29 8:30 ` Michael Albinus
2007-10-30 4:16 ` Daiki Ueno
2007-10-29 7:49 ` New Emacs facilities from Gnus (was: Gnus in Emacs is updated to No Gnus 0.7) Reiner Steib
2007-10-31 18:52 ` encrypt.el in No Gnus 0.7 (was: New Emacs facilities from Gnus) Ted Zlatanov
2007-10-31 20:36 ` encrypt.el in No Gnus 0.7 Reiner Steib
2007-10-31 21:05 ` Ted Zlatanov
2007-11-01 1:30 ` Daiki Ueno
2007-11-01 15:04 ` Ted Zlatanov
2007-11-01 15:24 ` Daiki Ueno
2007-11-01 23:08 ` Richard Stallman
2007-11-02 14:12 ` Ted Zlatanov
2007-11-02 21:36 ` Stefan Monnier
2007-11-04 19:56 ` Richard Stallman
2007-11-05 1:49 ` Ted Zlatanov
2007-11-05 8:47 ` Richard Stallman
2007-11-05 15:13 ` Ted Zlatanov
2007-11-06 2:16 ` Richard Stallman
2007-11-06 17:58 ` Ted Zlatanov
2007-11-07 7:56 ` Richard Stallman
2007-11-07 14:34 ` Ted Zlatanov
2007-11-08 0:58 ` Daiki Ueno
2007-11-08 1:16 ` Daiki Ueno
2007-11-08 14:48 ` Ted Zlatanov
2007-11-08 23:11 ` Daiki Ueno
2007-11-09 0:19 ` Leo
2007-11-09 2:39 ` Ted Zlatanov
2007-11-09 6:39 ` Stephen J. Turnbull
2007-11-10 3:00 ` Richard Stallman
2007-11-09 10:40 ` Sascha Wilde
2007-11-07 7:56 ` Richard Stallman
2007-11-07 14:47 ` Ted Zlatanov
2007-11-06 21:11 ` Reiner Steib
2007-11-07 15:01 ` Ted Zlatanov
2007-11-07 16:12 ` Stefan Monnier
2007-11-07 17:34 ` Ted Zlatanov
2007-11-07 16:47 ` Reiner Steib
2007-11-07 17:25 ` Ted Zlatanov
2007-11-02 14:08 ` Ted Zlatanov
2007-11-03 2:49 ` Daiki Ueno
2007-11-05 1:27 ` Ted Zlatanov
2007-11-05 1:37 ` Daiki Ueno
2007-11-01 7:32 ` encrypt.el in No Gnus 0.7 (was: New Emacs facilities from Gnus) Richard Stallman
2007-11-01 8:15 ` Daiki Ueno
2007-11-01 14:47 ` New Emacs facilities from Gnus Simon Josefsson
2007-11-01 16:16 ` Daiki Ueno
2007-11-01 20:09 ` Reiner Steib
2007-11-02 2:06 ` Richard Stallman
2007-11-04 19:56 ` New Emacs facilities from Gnus (was: Gnus in Emacs is updated to No Gnus 0.7) Richard Stallman
2007-11-14 23:41 ` New Emacs facilities from Gnus Lars Magne Ingebrigtsen
2007-11-04 19:56 ` New Emacs facilities from Gnus (was: Gnus in Emacs is updated to No Gnus 0.7) Richard Stallman
2007-11-14 23:42 ` New Emacs facilities from Gnus Lars Magne Ingebrigtsen
2007-11-15 13:07 ` Richard Stallman
2007-11-15 19:54 ` Lars Magne Ingebrigtsen
2007-11-16 18:32 ` Richard Stallman
2007-11-17 12:29 ` ecomplete.el (was: New Emacs facilities from Gnus) Reiner Steib
2007-11-17 23:31 ` Richard Stallman
[not found] ` <87lk8zr0e4.fsf@mocca.josefsson.org>
2007-11-17 12:28 ` Reiner Steib
2007-11-17 13:23 ` ecomplete.el Tassilo Horn
2007-11-18 2:18 ` ecomplete.el Bastien
2007-11-04 19:56 ` New Emacs facilities from Gnus (was: Gnus in Emacs is updated to No Gnus 0.7) Richard Stallman
2007-11-04 20:36 ` Manoj Srivastava [this message]
2007-11-05 8:47 ` New Emacs facilities from Gnus Richard Stallman
2007-11-22 20:50 ` Reiner Steib
2007-11-23 4:35 ` Richard Stallman
2007-11-04 21:12 ` Reiner Steib
2007-11-04 19:56 ` New Emacs facilities from Gnus (was: Gnus in Emacs is updated to No Gnus 0.7) Richard Stallman
2007-11-05 22:23 ` New Emacs facilities from Gnus Arne Jørgensen
2007-11-06 8:26 ` Stefan Monnier
2007-11-06 8:37 ` Richard Stallman
2007-11-06 22:35 ` Arne Jørgensen
2007-11-07 7:56 ` Richard Stallman
2007-11-07 16:58 ` Reiner Steib
2007-11-07 17:22 ` Stefan Monnier
2007-11-07 18:02 ` Reiner Steib
2007-11-07 18:20 ` Stefan Monnier
2007-11-09 10:45 ` Sascha Wilde
2007-11-09 12:14 ` Reiner Steib
2007-11-22 20:30 ` Reiner Steib
2007-11-06 11:33 ` New Emacs facilities from Gnus (was: Gnus in Emacs is updated to No Gnus 0.7) CHENG Gao
2007-11-06 18:45 ` New Emacs facilities from Gnus Reiner Steib
2007-11-07 3:35 ` CHENG Gao
2007-11-07 7:56 ` New Emacs facilities from Gnus (was: Gnus in Emacs is updated to No Gnus 0.7) Richard Stallman
2007-11-11 23:53 ` Richard Stallman
2007-11-13 1:39 ` New Emacs facilities from Gnus Ted Zlatanov
2007-11-13 20:03 ` Richard Stallman
2007-11-11 23:54 ` New Emacs facilities from Gnus (was: Gnus in Emacs is updated to No Gnus 0.7) Richard Stallman
2007-10-29 19:24 ` Gnus in Emacs is updated to No Gnus 0.7 Reiner Steib
2007-10-29 23:11 ` Miles Bader
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