How to do simple spam protection for form inputs?

[toplisek]

I enclose image as I would like to do simple spam protection and prevent automated sign-ups in registration forms.

How to do it this simple Captcha? I enclose image

[stephan.gerlach]

I am not sure how good this kind of spam protection is. I think it would be quite simple to get the 7 + 4 out of the html code and then actually calculate and post the result to your page.

I think spam protection using an image with characters and numbers is more secure. There is a really simple tutorial which is easy to follow at thie link.

http://www.codeproject.com/useritems/Web_Security.asp

Hope it will help

[toplisek]

Hi, thank you for reply.

I have sofisticated Captcha for registration form but need also simple for conatct form.

Can you give me advise how to do it with PHP?

[stephan.gerlach]

why can't you use the same captcha which you already used for registration?

[toplisek]

Because for registration shoul dbe more prevented as on contact form