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While disabling CSA, the software prompts for the user to type in a
text which is shown in a blurred fashion to the user. This is to
confirm that the users disabling it is doing it intentionally and also
not through any programmatic means. This technique is also widely used
while creating email a/c 's in yahoo and in several other places in the
web.

My question is , what is this technique known as ? How does the system
ensure that the text shown in the box is shown in a form which is
intelligble to the user ?

Can anybody in the forum explain ?

Thanks
Udaya

csudaya wrote:

Hello,

> While disabling CSA, the software prompts for the user to type in a
> text which is shown in a blurred fashion to the user. This is to
> confirm that the users disabling it is doing it intentionally and also
> not through any programmatic means. This technique is also widely used
> while creating email a/c 's in yahoo and in several other places in the
> web.
>
> My question is , what is this technique known as ?

AFAIK, it is known as "captcha". You have some interesting examples
here : http://sam.zoy.org/pwntcha/

> How does the system
> ensure that the text shown in the box is shown in a form which is
> intelligble to the user ?
>
> Can anybody in the forum explain ?
>
> Thanks
> Udaya
>

Hi Udaya,

The technique that you are referring to is called (CAPTCHA - Completely
Automated Public Turing test to tell Computers and Humans Apart). It is
an technique formulated by CMU. Check out the following website which
has lots of nice tit-bits about CAPTCHA ...

http://en.wikipedia.org/wiki/Captcha

-Sachin

http://www.SachinOnline.com