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POPractical non-image based CAPTCHA approaches?
 

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  1. POPractical non-image based CAPTCHA approaches?
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    <p>It looks like we'll be adding <a href="http://en.wikipedia.org/wiki/Captcha" rel="noreferrer">CAPTCHA</a> 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!</p> <p>We'll be using a JavaScript (jQuery) CAPTCHA as a first line of defense:</p> <p><a href="http://docs.jquery.com/Tutorials:Safer_Contact_Forms_Without_CAPTCHAs" rel="noreferrer">http://docs.jquery.com/Tutorials:Safer_Contact_Forms_Without_CAPTCHAs</a></p> <p>The advantage of this approach is that, <strong>for most people, the CAPTCHA won't ever be visible!</strong></p> <p>However, for people with JavaScript disabled, we still need a fallback and this is where it gets tricky.</p> <p>I have written a <a href="http://www.codeproject.com/KB/custom-controls/CaptchaControl.aspx" rel="noreferrer">traditional CAPTCHA control for ASP.NET</a> which we can re-use.</p> <p><img src="https://i.stack.imgur.com/Puvbf.jpg" alt="CaptchaImage"></p> <p>However, I'd prefer to go with something textual to avoid the overhead of creating all these images on the server with each request.</p> <p>I've seen things like..</p> <ul> <li>ASCII text captcha: <code>\/\/(_)\/\/</code></li> <li>math puzzles: what is 7 minus 3 times 2?</li> <li>trivia questions: what tastes better, a toad or a popsicle?</li> </ul> <p>Maybe I'm just tilting at windmills here, but I'd like to have a less resource intensive, non-image based <code>&lt;noscript&gt;</code> compatible CAPTCHA if possible.</p> <p>Ideas?</p>
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    1. USJeff Atwood
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    1. CODo you intend to use captchas for registering or for every post? Personally I think anyone who manages to get over a certain threshhold of rep should be immune to Captchas...
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      1. POPractical non-image based CAPTCHA approaches?
      1. USOmar Kooheji
    2. COThere is no need to actually create an image on the server. You just need to handle the request. For example <img src="generateImage.aspx?guid=blah">
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      1. USBrian R. Bondy
    3. COTrivia questions are prone to cultural bias (think of a french guy answering your question...). Furthermore, they can tackle users whose English isn't native. Also, they can easily be broken using brute force (you only have ~2^#_OfQuestions options).
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      1. USAdam Matan
 

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