From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1M9RVe-0008W3-Ds for garchives@archives.gentoo.org; Wed, 27 May 2009 22:22:07 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 24BFFE0450; Wed, 27 May 2009 22:22:04 +0000 (UTC) Received: from castor.sshunet.nl (castor.sshunet.nl [145.97.192.41]) by pigeon.gentoo.org (Postfix) with ESMTP id EB755E0450 for ; Wed, 27 May 2009 22:22:03 +0000 (UTC) Received: from localhost (localhost.localdomain [127.0.0.1]) by castor.sshunet.nl (Postfix) with ESMTP id 533AE57C006; Thu, 28 May 2009 00:22:02 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at castor.sshunet.nl Received: from castor.sshunet.nl ([127.0.0.1]) by localhost (castor.sshunet.nl [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QEsSUJAMUFkM; Thu, 28 May 2009 00:22:02 +0200 (CEST) Received: from [145.97.223.187] (187pc223.sshunet.nl [145.97.223.187]) by castor.sshunet.nl (Postfix) with ESMTP; Thu, 28 May 2009 00:22:02 +0200 (CEST) Message-ID: <4A1DBCB3.4010808@gentoo.org> Date: Thu, 28 May 2009 00:20:35 +0200 From: "Marijn Schouten (hkBst)" User-Agent: Thunderbird 2.0.0.21 (X11/20090320) Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Project discussion list X-BeenThere: gentoo-project@lists.gentoo.org MIME-Version: 1.0 To: "Robin H. Johnson" CC: gentoo-project@lists.gentoo.org Subject: Re: [gentoo-project] Spam reduction proposal - switching lists to a web-form for subscription References: <4A1D6C7C.7090605@gentoo.org> <4A1D8A44.3090101@gmail.com> In-Reply-To: X-Enigmail-Version: 0.95.7 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Archives-Salt: baada427-e943-4691-b338-46c10eff0c95 X-Archives-Hash: f9664aeff8742c7fec1275bd914dd559 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Robin H. Johnson wrote: > On Wed, May 27, 2009 at 01:45:24PM -0500, Dale wrote: >> Is there something besides a captcha that can be used? I hate those >> things because they make no sense to me. I usually just give up when I >> encounter one of these and try three or four times with no success. The >> ones that look like broken glass or something are the ones I don't even >> try anymore. I can't get past one of those. > recaptcha [1] is very common at this point, offloads the problem to an > external service, supports visually-challenged users, and includes it's > own detection of brute forcing from IP addresses and subnets. > > If that's not acceptable to you, I'll just deploy calculus-captcha. > calculus-captcha is best viewed on this page here: > http://random.irb.hr/signup.php > (reload a few times to see the fun they had in qualifying questions). The reCAPTCHA page mentions[1] that simple text recognition (with minimal distortion) is easy to do with computer programs. Given that the calculus-captcha are non-distorted LaTeX'ed formulas we should therefore probably assume that computers can read those formulas. They only seem to have very few kinds of questions (zeros of small polynomials, differentiation of some trigonometric functions (only cos and sin), arithmetic), all of which are extremely simple especially for a program[1]. If this CAPTCHA becomes widespread someone WILL break it. On the other hand I like that reCAPTCHA puts your answers to use for automatic digitizations of books. Unfortunately their "Stop spam, read books" message doesn't make this very clear unless you already know. Marijn [1]:http://recaptcha.net/captcha.html - -- If you cannot read my mind, then listen to what I say. Marijn Schouten (hkBst), Gentoo Lisp project, Gentoo ML , #gentoo-{lisp,ml} on FreeNode -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.11 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkodvLMACgkQp/VmCx0OL2zK/QCgmt+/RincRzXtmuGNTxsE4Yd+ wo8An2zcFsPPaxpzbB75lYlnFCAg1o8q =glct -----END PGP SIGNATURE-----