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Robin H. Johnson wrote: |
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> On Wed, May 27, 2009 at 01:45:24PM -0500, Dale wrote: |
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>> Is there something besides a captcha that can be used? I hate those |
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>> things because they make no sense to me. I usually just give up when I |
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>> encounter one of these and try three or four times with no success. The |
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>> ones that look like broken glass or something are the ones I don't even |
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>> try anymore. I can't get past one of those. |
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> recaptcha [1] is very common at this point, offloads the problem to an |
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> external service, supports visually-challenged users, and includes it's |
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> own detection of brute forcing from IP addresses and subnets. |
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> |
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> If that's not acceptable to you, I'll just deploy calculus-captcha. |
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> calculus-captcha is best viewed on this page here: |
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> http://random.irb.hr/signup.php |
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> (reload a few times to see the fun they had in qualifying questions). |
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The reCAPTCHA page mentions[1] that simple text recognition (with minimal |
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distortion) is easy to do with computer programs. Given that the |
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calculus-captcha are non-distorted LaTeX'ed formulas we should therefore |
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probably assume that computers can read those formulas. They only seem to have |
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very few kinds of questions (zeros of small polynomials, differentiation of some |
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trigonometric functions (only cos and sin), arithmetic), all of which are |
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extremely simple especially for a program[1]. If this CAPTCHA becomes widespread |
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someone WILL break it. |
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|
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On the other hand I like that reCAPTCHA puts your answers to use for automatic |
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digitizations of books. Unfortunately their "Stop spam, read books" message |
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doesn't make this very clear unless you already know. |
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Marijn |
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[1]:http://recaptcha.net/captcha.html |
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- -- |
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If you cannot read my mind, then listen to what I say. |
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|
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Marijn Schouten (hkBst), Gentoo Lisp project, Gentoo ML |
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<http://www.gentoo.org/proj/en/lisp/>, #gentoo-{lisp,ml} on FreeNode |
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Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org |
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iEYEARECAAYFAkodvLMACgkQp/VmCx0OL2zK/QCgmt+/RincRzXtmuGNTxsE4Yd+ |
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wo8An2zcFsPPaxpzbB75lYlnFCAg1o8q |
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=glct |
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