This blog is retired.


The best CAPTCHA ever

It’s an old joke now, but anyway it worth repeating. And I really like this CAPTCHA:
CAPTCHA with math

Are you challenged to solve it?

Even if not, you are welcome to read comments on digg.

It’s hard to trace the origin of this CAPTCHA. Most likely, if I remember correctly, it was first published in Novosibirsk State University, Russia.

4 Responses to “The best CAPTCHA ever”

  1. kruglov Says:

    Some software can solve equations and expressions.
    Mathematica, MathCAD…

  2. olpa Says:

    Hello Sergei, welcome to the blog.

    : Some software can solve equations and expressions.
    Yes, People at Digg followed this way and got the correct answer. And for some of us the asnwer is obvious without software.

    Anyway, the quiz is very good to stop bots.

  3. Spam Bots and CAPTCHAs » Blog Archive » Craziest Captchas on the Web Says:

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    […] best CAPTCHA ever - 2 I already wrote about The best CAPTCHA ever — it’s a simple, but impressive looking math expression. Use of a scientific CAPTCHA is […]