From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.emacs.gnus.general/45433 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: Sat, 29 Jun 2002 09:56:22 -0400 Organization: The Happy Fun Ball Brigade Sender: owner-ding@hpc.uh.edu Message-ID: References: <02Jun24.115740edt.119250@gateway.intersystems.com> <02Jun24.151839edt.119751@gateway.intersystems.com> <02Jun25.104630edt.119271@gateway.intersystems.com> <02Jun28.122222edt.119118@gateway.intersystems.com> <02Jun28.172137edt.119392@gateway.intersystems.com> NNTP-Posting-Host: localhost.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: main.gmane.org 1025359061 6413 127.0.0.1 (29 Jun 2002 13:57:41 GMT) X-Complaints-To: usenet@main.gmane.org NNTP-Posting-Date: Sat, 29 Jun 2002 13:57:41 +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 17OIjN-0001fK-00 for ; Sat, 29 Jun 2002 15:57:41 +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 17OIiR-0000sK-00; Sat, 29 Jun 2002 08:56:43 -0500 Original-Received: by sina.hpc.uh.edu (TLB v0.09a (1.20 tibbs 1996/10/09 22:03:07)); Sat, 29 Jun 2002 08:57:04 -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 IAA01222 for ; Sat, 29 Jun 2002 08:56:51 -0500 (CDT) Original-Received: (qmail 11205 invoked by alias); 29 Jun 2002 13:56:25 -0000 Original-Received: (qmail 11200 invoked from network); 29 Jun 2002 13:56:25 -0000 Original-Received: from h0060978d8c91.ne.client2.attbi.com (HELO peorth.gweep.net) (yvwwdr@24.218.202.161) by gnus.org with SMTP; 29 Jun 2002 13:56:25 -0000 Original-Received: (from ratinox@localhost) by peorth.gweep.net (8.11.6/8.11.6) id g5TDuNF02901; Sat, 29 Jun 2002 09:56:23 -0400 Original-To: "(ding)" X-Attribution: Rat In-Reply-To: (Simon Josefsson's message of "Sat, 29 Jun 2002 13:46:18 +0200") Original-Lines: 41 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:45433 X-Report-Spam: http://spam.gmane.org/gmane.emacs.gnus.general:45433 * Simon Josefsson on Sat, 29 Jun 2002 | To put mail with valid hashcash in a separate, supposedly spam-free, | mailbox. But since spammers can generate hashes themselves, your supposedly spam-free X-Hashcash (not hashcash!) mailbox will not be spam-free. | I don't understand this argument, the whole point of hashcash is that | you need to spend CPU to overcome it. How you aquire that CPU is | irrelevant. If all spammers were required to acquire it using sub7, | people would start to fix the sub7 problem, not stop using hashcash, | and things would be fine. Using Sub7 for generating hashes is not a mechanism for sending spam, it is a Denial of Service attack against the X-Hashcash database, to make it grow to unweildly size and to fill it with hashes that cause false positives. All the words matter. You also still seem not understand what Sub7 is. I suggest you read up on in just as I read up on X-Hashcash. | 30 bits would allow a desktop PC to send 16 mails per day, that's | probably more that I need. Yes, well, this is not about -you-. 16 messages in a 24 hour period for me would basically make it impossible for me to do my job as a Unix admin. | If you use too few bits (like anything under 23-24), spammers will have | it to easy to acquire that amount of CPU. 29 bits have been suggested as | a value to use in practice. Funny, the defaults I have seen for both X-Hashcash and hashcash are 18-22 bits. -- Rat \ Caution: Happy Fun Ball may suddenly Minion of Nathan - Nathan says Hi! \ accelerate to dangerous speeds. PGP Key: at a key server near you! \ That and five bucks will get you a small coffee at Starbucks.