From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.emacs.gnus.general/45362 Path: main.gmane.org!not-for-mail From: Stainless Steel Rat Newsgroups: gmane.emacs.gnus.general Subject: Re: [ANNOUNCE] contrib/hashcash.el spam fighter Date: Sun, 23 Jun 2002 17:34:36 -0400 Organization: The Happy Fun Ball Brigade Sender: owner-ding@hpc.uh.edu Message-ID: References: NNTP-Posting-Host: localhost.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: main.gmane.org 1024868113 12350 127.0.0.1 (23 Jun 2002 21:35:13 GMT) X-Complaints-To: usenet@main.gmane.org NNTP-Posting-Date: Sun, 23 Jun 2002 21:35:13 +0000 (UTC) Return-path: Original-Received: from malifon.math.uh.edu ([129.7.128.13]) by main.gmane.org with esmtp (Exim 3.33 #1 (Debian)) id 17MF0q-0003D5-00 for ; Sun, 23 Jun 2002 23:35:12 +0200 Original-Received: from sina.hpc.uh.edu ([129.7.128.10] ident=lists) by malifon.math.uh.edu with esmtp (Exim 3.20 #1) id 17MF0c-00030N-00; Sun, 23 Jun 2002 16:34:58 -0500 Original-Received: by sina.hpc.uh.edu (TLB v0.09a (1.20 tibbs 1996/10/09 22:03:07)); Sun, 23 Jun 2002 16:35:19 -0500 (CDT) Original-Received: from sclp3.sclp.com (qmailr@sclp3.sclp.com [209.196.61.66]) by sina.hpc.uh.edu (8.9.3/8.9.3) with SMTP id QAA19183 for ; Sun, 23 Jun 2002 16:35:08 -0500 (CDT) Original-Received: (qmail 21539 invoked by alias); 23 Jun 2002 21:34:42 -0000 Original-Received: (qmail 21534 invoked from network); 23 Jun 2002 21:34:42 -0000 Original-Received: from h0060978d8c91.ne.client2.attbi.com (HELO peorth.gweep.net) (kashwk@24.218.202.161) by gnus.org with SMTP; 23 Jun 2002 21:34:42 -0000 Original-Received: (from ratinox@localhost) by peorth.gweep.net (8.11.6/8.11.6) id g5NLYbX08891; Sun, 23 Jun 2002 17:34:37 -0400 Original-To: "(ding)" X-Attribution: Rat In-Reply-To: (Simon Josefsson's message of "Sun, 23 Jun 2002 19:59:30 +0200") Original-Lines: 20 User-Agent: Gnus/5.090006 (Oort Gnus v0.06) XEmacs/21.1 (Cuyahoga Valley, i686-pc-linux) Precedence: list X-Majordomo: 1.94.jlt7 Xref: main.gmane.org gmane.emacs.gnus.general:45362 X-Report-Spam: http://spam.gmane.org/gmane.emacs.gnus.general:45362 * Simon Josefsson on Sun, 23 Jun 2002 | 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. For the sake of argument, say that hashcash.el users want a 128 bit hash. Today I calculate a 128 bit hash and send out a million messages using that hash in the X-Hashcash header. Tomorow I generate a new 128 bit hash so that the old one is no longer useful as filter bait, and send out another million messages. I repeat this cycle indefinitely. Please explain to me where in this scheme I am burning any significant CPU time generating hashes, or how it forces the spammer to do more work than the recipients, because I cannot see it. -- Rat \ Happy Fun Ball may stick to certain types Minion of Nathan - Nathan says Hi! \ of skin. PGP Key: at a key server near you! \ That and five bucks will get you a small coffee at Starbucks.