Securing Web Email pages by changing Pictures with letters

[JonnyPoet]

Hi friends !

I have seen some internet pages where you can send a request to a firm. If you want to do the request additional to your data, you need to type in some letters which are obviously painted into a picture so it cannot get readout by simple looking into the pages HTML source. text This gives security against auto spammers abuse of such pages IMHO.

The letters most arn't in one line, have sometimes different sizes and colors are maybe turned to some degree. Could be read by human, but not by automatic code. Great !

I want to use such a system for a page of my own, so where to get this web-control which paints such pictures. Or could this be easily created by C# code? Whats the name for such controls, so I can google for it ? :wave:

[MMH]

Hi friends !

I have seen some internet pages where you can send a request to a firm. If you want to do the request additional to your data, you need to type in some letters which are obviously painted into a picture so it cannot get readout by simple looking into the pages HTML source. text This gives security against auto spammers abuse of such pages IMHO.

The letters most arn't in one line, have sometimes different sizes and colors are maybe turned to some degree. Could be read by human, but not by automatic code. Great !

I want to use such a system for a page of my own, so where to get this web-control which paints such pictures. Or could this be easily created by C# code? Whats the name for such controls, so I can google for it ? :wave:

This is called as "CAPTCHA" image.
-Completely Automated Public Turing test to tell Computers and Humans Apart.

Search net using "CAPTCHA" keyword.

Also look into the following:
http://www.captcha.net/

[JonnyPoet]

http://www.captcha.net/That was exactly what I wanted to know. Thx a lot

[toraj58]

this question also was my question and the answer was very helpful to me also.

[JonnyPoet]

this question also was my question and the answer was very helpful to me also.Now knowing what is exactly needed to do I'm just starting to create my own random asp.net solution using C# :)