Re: [OSGeo-Discuss] Some cialis spam in the wiki...
Just because a user has succeeded at the captcha does not mean he is indeed human. It's been proven by various researchers that beating captchas is entirely possible. Optical character recognition, like that used in flatbed scanner software, can be used with a fairly high success rate. Another technique is to build expert systems to evaluate the images. Another still is to build a map of hashes corresponding to captcha images with the solutions as value. Getting rid of spammers is a real pain. Captchas, IP bans and user registration limits all help but nothing really prevents it. Registration confirmation by humans is, unfortunately, the only way to be certain but not particularly convenient. The only thing I can think of that might work better is to build a filter layer into editing pages that scans the edit for words like "cialis" and if they are present sends an email to system administrators to confirm the edit. This would allow people to occasionally use banned words in legitimate uses but also flag spammers very quickly. René Markus Neteler a écrit : On Sun, Jul 5, 2009 at 3:02 PM, Anne Ghisla wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Dave Patton ha scritto: ... There is a MediaWiki Extension for reCaptcha [1] http://recaptcha.net/plugins/mediawiki/ [1] http://recaptcha.net/learnmore.html http://en.wikipedia.org/wiki/ReCAPTCHA It is already active on new user registration, so maybe part of the spam comes from human beings :S, then another way to limitate such spam is ConfirmAccout extension [0], that requires sysops to confirm new users one by one. This is extra load - but removing spam is extra load as well. One am one of them - please don't :) I am dealing with Wikis for many years. These human spammers always went away so far after a period. The overhead to manually delete a page from time to time is much less than confirming manually new users (which is also a non-incentive since they cannot start to hack the Wiki right away...). I don't mind to continue to delete those spam pages manually. Cheers Markus ___ Discuss mailing list Discuss@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/discuss ___ Discuss mailing list Discuss@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/discuss
Re: [OSGeo-Discuss] Some cialis spam in the wiki...
On Sun, Jul 5, 2009 at 3:02 PM, Anne Ghisla wrote: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA1 > > Dave Patton ha scritto: ... >> There is a MediaWiki Extension for reCaptcha [1] >> http://recaptcha.net/plugins/mediawiki/ >> >> [1] >> http://recaptcha.net/learnmore.html >> http://en.wikipedia.org/wiki/ReCAPTCHA > > It is already active on new user registration, so maybe part of the spam > comes from human beings :S, then another way to limitate such spam is > ConfirmAccout extension [0], that requires sysops to confirm new users > one by one. This is extra load - but removing spam is extra load as well. One am one of them - please don't :) I am dealing with Wikis for many years. These human spammers always went away so far after a period. The overhead to manually delete a page from time to time is much less than confirming manually new users (which is also a non-incentive since they cannot start to hack the Wiki right away...). I don't mind to continue to delete those spam pages manually. Cheers Markus ___ Discuss mailing list Discuss@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/discuss
Re: [OSGeo-Discuss] Some cialis spam in the wiki...
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Dave Patton ha scritto: > On 2009/07/04 8:00 AM, Tyler Mitchell (OSGeo) wrote: >> >> Anne Ghisla wrote: >>> Is this enough to avoid such spam? Is't captcha better? >>> I can have a look at how it can be implemented in user login (I know it >>> is already active when a user adds external links to a page). >> >> Go for it. If you find instructions, I can enable it. > > There is a MediaWiki Extension for reCaptcha [1] > http://recaptcha.net/plugins/mediawiki/ > > [1] > http://recaptcha.net/learnmore.html > http://en.wikipedia.org/wiki/ReCAPTCHA It is already active on new user registration, so maybe part of the spam comes from human beings :S, then another way to limitate such spam is ConfirmAccout extension [0], that requires sysops to confirm new users one by one. This is extra load - but removing spam is extra load as well. HTH, best regards, Anne [0] http://www.mediawiki.org/wiki/Extension:ConfirmAccount -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkpQpEgACgkQzZ3g4YwFFgYQdQCeOLbrsKKFoiTxK5oz9H9Hhkm4 DWkAoIzpVusGZEklVs/25eJiq3J56ln9 =AZ9s -END PGP SIGNATURE- ___ Discuss mailing list Discuss@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/discuss
Re: [OSGeo-Discuss] Military OSS
On Wed, Jul 1, 2009 at 4:27 PM, Michael P. Gerlek wrote: > (sorry, that wasn't supposed to go to the whole list - still getting used to > the iPhone...) No - the problem is the odd setup of this list (unique in OSGeo?) which changes replies to the list instead of the poster as most other lists do. http://www.unicom.com/pw/reply-to-harmful.html We should follow also here the "Principle of Least Surprise" and change the list settings. Markus ___ Discuss mailing list Discuss@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/discuss
