https://bugzilla.wikimedia.org/show_bug.cgi?id=62960

            Bug ID: 62960
           Summary: Prototype CAPTCHA optimized for multilingual and
                    mobile
           Product: MediaWiki extensions
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: Unprioritized
         Component: ConfirmEdit (CAPTCHA extension)
          Assignee: wikibugs-l@lists.wikimedia.org
          Reporter: q...@wikimedia.org
       Web browser: ---
   Mobile Platform: ---

This is an enhancement request related to
https://www.mediawiki.org/wiki/Mentorship_programs/Possible_projects#Multilingual.2C_usable_and_effective_captchas

There has been a lot of discussion about the effectiveness of captchas and the
amount of investment we should put on this area. However, the fact is that
captchas are deployed in Wikimedia projects, and they are used for combating
spam and other misuses on a daily basis. It is also a fact that the current
approach (text based) is not optimal for desktop, and clearly problematic for
mobile, where reading and typing becomes more difficult. Also, the current
model is based in English language / Latin text string, which puts a majority
of users in disadvantage.

For all these reasons it is worth investigating a way forward, keeping the
current approach of using captchas. (It is also worth considering full
alternatives departing from the CAPTCHA techniques, but please discuss them
elsewhere)

Any proposal in this direction should comply with these requirements:

* At least as efficient combating spam as the current CAPTCHA method used in
Wikimedia projects. Text-based captchas are claimed to be breakable about 25%
of the times, according to
http://cdn.ly.tl/publications/text-based-captcha-strengths-and-weaknesses.pdf

* A clear solution for sourcing CAPTCHA context automatically from big pools of
free text/files. The system proposed cannot rely on manual selection or other
types of extra human work.

* Non-discriminatory to users depending on their language.

* Usable in a mobile context.

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