https://bugzilla.wikimedia.org/show_bug.cgi?id=63216
Bug ID: 63216
Summary: Only accept CAPTCHA responses with diacritics removed
Product: MediaWiki extensions
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: ConfirmEdit (CAPTCHA extension)
Assignee: wikibugs-l@lists.wikimedia.org
Reporter: m...@1ec5.org
Web browser: ---
Mobile Platform: ---
With a fix for bug 5309, such as the one discussed at
<https://gerrit.wikimedia.org/r/121255/>, it’s entirely possible that a user
might get a CAPTCHA with illegible diacritics. Diacritics in Latin alphabets
can look identical to one another when distorted, for example i í ì ỉ, or ó ơ.
For better usability, ConfirmEdit should display a CAPTCHA containing
diacritics but require the user to enter the characters without diacritics.
There’s a third-party module called Unidecode that does a decent job of accent
folding.
One tradeoff would be that such CAPTCHAs might be easier for a bot to crack.
There’s also the issue that a character like Ê might be considered a base
letter in one language (as in Vietnamese) but a letter with a diacritic in
another (Portuguese).
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