From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.emacs.gnus.general/45930 Path: main.gmane.org!not-for-mail From: Stainless Steel Rat Newsgroups: gmane.emacs.gnus.general Subject: Re: new spam functionality added Date: Wed, 31 Jul 2002 22:17:15 -0400 Organization: The Happy Fun Ball Brigade Sender: owner-ding@hpc.uh.edu Message-ID: References: <87y9brejam.fsf@mail.paradoxical.net> <873ctztyth.fsf@mail.paradoxical.net> <02Jul31.171132edt.119710@gateway.intersystems.com> <87fzxzsit2.fsf@mail.paradoxical.net> NNTP-Posting-Host: localhost.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: main.gmane.org 1028168262 15723 127.0.0.1 (1 Aug 2002 02:17:42 GMT) X-Complaints-To: usenet@main.gmane.org NNTP-Posting-Date: Thu, 1 Aug 2002 02:17:42 +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 17a5X1-00045M-00 for ; Thu, 01 Aug 2002 04:17:39 +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 17a5Ww-0002iS-00; Wed, 31 Jul 2002 21:17:34 -0500 Original-Received: by sina.hpc.uh.edu (TLB v0.09a (1.20 tibbs 1996/10/09 22:03:07)); Wed, 31 Jul 2002 21:18:00 -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 VAA10378 for ; Wed, 31 Jul 2002 21:17:48 -0500 (CDT) Original-Received: (qmail 3117 invoked by alias); 1 Aug 2002 02:17:17 -0000 Original-Received: (qmail 3112 invoked from network); 1 Aug 2002 02:17:16 -0000 Original-Received: from h0060978d8c91.ne.client2.attbi.com (HELO peorth.gweep.net) (amtuwh@24.218.202.161) by gnus.org with SMTP; 1 Aug 2002 02:17:16 -0000 Original-Received: (from ratinox@localhost) by peorth.gweep.net (8.11.6/8.11.6) id g712HFg04487; Wed, 31 Jul 2002 22:17:15 -0400 Original-To: "(ding)" X-Attribution: Rat In-Reply-To: (Scott A Crosby's message of "31 Jul 2002 20:33:06 -0500") Original-Lines: 26 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:45930 X-Report-Spam: http://spam.gmane.org/gmane.emacs.gnus.general:45930 * Scott A Crosby on Wed, 31 Jul 2002 | Unlikely. If the hashcash is redeemable for cash, then either it has | to be about $.0001, Er... no. There is money directly involved. In brief, hashcash works like this: You want to send me mail. You compose your message and hand it off to your MTA for delivery. Your MTA contacts my MTA. My MTA generates a random string (a random number) and mashes it through SHA-1. My MTA gives your MTA that string and says, "find me another string that has an SHA-1 hash with N bits of collision". Your MTA spends a few seconds generating random strings and mashing them through SHA-1 until it generates a hash that has N similar bits. Your MTA gives me that string. My MTA validates it, and then accepts your message. The idea is to make every sending MTA spend a bit of CPU time doing something in a proveable way before accepting their messages. Spammers simply will not be able to survive because it will take too long for their rogue spamware MTAs to push out their junk. -- Rat \ Do not use Happy Fun Ball on concrete. Minion of Nathan - Nathan says Hi! \ PGP Key: at a key server near you! \ That and five bucks will get you a small coffee at Starbucks.