How can I set up a knowledge based authentication for my drupal sign up?

Comments

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not sure how you would pull this off for a registration since the database wouldn't contain any data about a user yet. However one can utilize http://drupal.org/project/password-reset for creation of a kba style password reset.

I asked wrong question

The other day I came across a forum which on signing up asked difficult maths equation questions in order to join and I thought that is a good idea to get rid of human spammers unless they were particularly good at maths.

For mine I want to ask a question that only locals would know the answer to and in that way would mean no need for manual authentication.

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math captcha is included in the captcha module @ http://drupal.org/project/captcha . for questions see http://drupal.org/project/riddler which is an addon module for captcha

oh ok

well did you see my other post? hope someone knows why riddle is not allowing more than one riddle to be answered, I mean it is allowing but not implementing it.
I figure if I put two riddles on my reg form that should do the trick against spammers :)