Practical non-image based CAPTCHA approaches?

Question :

Practical non-image based CAPTCHA approaches?,

Answer :

It looks like we’ll be adding support to Stack Overflow. This is necessary to prevent bots, spammers, and other malicious scripted activity. We only want human beings to post or edit things here!

We’ll be using a JavaScript (jQuery) CAPTCHA as a first line of defense:

 

The advantage of this approach is that, for most people, the CAPTCHA won’t ever be visible!

However, for people with JavaScript disabled, we still need a fallback and this is where it gets tricky.

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I have written a which we can re-use.

However, I’d prefer to go with something textual to avoid the overhead of creating all these images on the server with each request.

I’ve seen things like..

  • ASCII text captcha: //(_)//
  • math puzzles: what is 7 minus 3 times 2?
  • trivia questions: what tastes better, a toad or a popsicle?

Maybe I’m just tilting at windmills here, but I’d like to have a less resource intensive, non-image based

Ideas?

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Disclaimer :

The answers provided above are only to be used to guide the learning process. The questions above are open-ended questions, meaning that many answers are not fixed as above. I hope this article can be useful, Thank you