A lot has been said and written about CAPTCHAS.
It has been said that Captchas suffer from lack of efficiency in preventing spam mail,
That Captchas are easy to be cracked by bots,
That human users get pissed off when they try to decipher Capchas,
That Captchas discriminate disabled users with sight problems or dyslectic persons,
That it’s about time to change the system…etc,’ etc’,
Well, incidentally, I’ve read an article lately about reverse Captcha and I said to myself:
Wow! That’s a great idea! Why haven’t all those smart guys thought about it earlier…
The idea of Reverse Captcha is based on a system which tries to trap the bot spammer, not the human user.
How?
Well, the well known Captcha sets a turning test for the human user before submission. Usually it consists an image with distorted alphanumeric letters and the user is asked to decipher and copy into a certain blank field. The system is based on an assumption that bots are not intelligent so they are doomed to fail. Unfortunately, robots become more and more “smart” thanks to high technology, and so a great percentage of Captchas are cracked.
Reverse Captcha is a turning test which bots can deal with and but humans will fail! How? Very simple: BY using a hidden filed which humans do not recognize. Bots fill out every field trying not to miss anything, and so they are trapped and filtered out of non desire submission.
A genius idea!
February 6th, 2010 at 5:30 pm
[...] item, saying that new captcha is about to get in town. The innovation of this new “no more spam bots on the web” captcha is that it requires the user to authenticate himeself as a human operator [...]
May 3rd, 2010 at 9:30 am
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