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Timeline for Practical non-image based CAPTCHA approaches?

Current License: CC BY-SA 3.0

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May 23, 2017 at 12:34 history edited URL Rewriter Bot
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Oct 29, 2011 at 17:47 history edited Gennady Vanin Геннадий Ванин CC BY-SA 3.0
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Sep 12, 2011 at 22:44 comment added Dan You've outlined the problem with almost every answer on this thread. They all would be defeated quickly if they weren't exclusive to tiny website. If any of them were used on a large website or a number of small websites (say as a Wordpress plugin), they would be defeated in a day. They really aren't CAPTCHAS, but lucky cases of security through obscurity. You are also right on; modern spam is putting comments that even I cannot recognize as spam. I've given up on CAPTCHA and instead use Mollom. Crowdsourcing spam is a better approach imho.
Jan 15, 2011 at 8:38 history edited Gennady Vanin Геннадий Ванин CC BY-SA 2.5
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Jan 15, 2011 at 8:30 history edited Gennady Vanin Геннадий Ванин CC BY-SA 2.5
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Dec 29, 2010 at 12:11 history edited Gennady Vanin Геннадий Ванин CC BY-SA 2.5
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Dec 21, 2010 at 6:57 history edited Gennady Vanin Геннадий Ванин CC BY-SA 2.5
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Dec 21, 2010 at 2:22 history edited Gennady Vanin Геннадий Ванин CC BY-SA 2.5
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Dec 20, 2010 at 23:12 history edited Gennady Vanin Геннадий Ванин CC BY-SA 2.5
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Dec 20, 2010 at 15:02 history edited Gennady Vanin Геннадий Ванин CC BY-SA 2.5
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Dec 20, 2010 at 12:07 history edited Gennady Vanin Геннадий Ванин CC BY-SA 2.5
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Dec 20, 2010 at 11:58 history answered Gennady Vanin Геннадий Ванин CC BY-SA 2.5