Last modified: 2010-05-16 20:31:03 UTC
http://moinmo.in/TextCha is a possibility to provide simpler and better captchas than with images and audio. and it has the advantage to be equal for vision impaired persons.
Just wanted to note that a blind user also brought this up at Jimbo's en-wiki talk page--I have to agree that it's a good idea.
I've changed the product to MediaWiki extensions as it is about an extension (ConfirmEdit).
TextCha looks very similar to the already implemented QuestyCaptcha interface. Main difference seems to be that moinmoin could allow several answers to the same question, being a regex (easy to add if needed).
Basically, when using QuestyCaptcha you provide a secret set of questions whose answer cannot be automated (eg. what's this wiki name?, In which year did [[World War II]] finish?).
The main disadvantages for large wikis like wikipedia are:
-You cannot automatically create new questions, they have to be made by a human (and a small questions set makes it inefficient).
-Questions have to be different for each language.