From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.emacs.gnus.general/45365 Path: main.gmane.org!not-for-mail From: Kai.Grossjohann@CS.Uni-Dortmund.DE (Kai =?iso-8859-15?q?Gro=DFjohann?=) Newsgroups: gmane.emacs.gnus.general Subject: Re: [ANNOUNCE] contrib/hashcash.el spam fighter Date: Mon, 24 Jun 2002 10:20:25 +0200 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 1024906944 27405 127.0.0.1 (24 Jun 2002 08:22:24 GMT) X-Complaints-To: usenet@main.gmane.org NNTP-Posting-Date: Mon, 24 Jun 2002 08:22:24 +0000 (UTC) Cc: ding@gnus.org 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 17MP79-00077u-00 for ; Mon, 24 Jun 2002 10:22:24 +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 17MP6K-0003ys-00; Mon, 24 Jun 2002 03:21:32 -0500 Original-Received: by sina.hpc.uh.edu (TLB v0.09a (1.20 tibbs 1996/10/09 22:03:07)); Mon, 24 Jun 2002 03:21:53 -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 DAA20020 for ; Mon, 24 Jun 2002 03:21:40 -0500 (CDT) Original-Received: (qmail 21464 invoked by alias); 24 Jun 2002 08:21:04 -0000 Original-Received: (qmail 21454 invoked from network); 24 Jun 2002 08:21:03 -0000 Original-Received: from waldorf.cs.uni-dortmund.de (129.217.4.42) by gnus.org with SMTP; 24 Jun 2002 08:21:03 -0000 Original-Received: from lothlorien.cs.uni-dortmund.de (lothlorien [129.217.19.67]) by waldorf.cs.uni-dortmund.de with ESMTP id g5O8KVb27647; Mon, 24 Jun 2002 10:20:31 +0200 (MES) Original-Received: from lucy.cs.uni-dortmund.de (lucy [129.217.19.80]) by lothlorien.cs.uni-dortmund.de id KAA25451; Mon, 24 Jun 2002 10:20:26 +0200 (MET DST) Original-Received: by lucy.cs.uni-dortmund.de (Postfix, from userid 6104) id B56593B5E4; Mon, 24 Jun 2002 10:20:25 +0200 (CEST) Original-To: David Masterson Mail-Followup-To: David Masterson , ding@gnus.org In-Reply-To: (David Masterson's message of "23 Jun 2002 22:41:05 -0700") Original-Lines: 17 User-Agent: Gnus/5.090007 (Oort Gnus v0.07) Emacs/21.3.50 (i686-pc-linux-gnu) Precedence: list X-Majordomo: 1.94.jlt7 Xref: main.gmane.org gmane.emacs.gnus.general:45365 X-Report-Spam: http://spam.gmane.org/gmane.emacs.gnus.general:45365 David Masterson writes: > Is that the method of using hashcash? It would seem for it to be used > as postage, the hash would have to be calculated for each person you > (the spammer) want to send email to (assuming everyone was requiring > postage). Therefore, it's not compute 1 128-bit hash and send out a > million messages, but rather compute a million 128-bit hashes to apply > to each message. How do the spam recipients know whether the hash has been reused? If they can tell the hash has been reused, then they can refuse the message. But probably, they can't tell and so they think everything is fine and dandy. kai -- A large number of young women don't trust men with beards. (BFBS Radio)