Captcha – Protect Web Form

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Why do people spam webforms?
- There are some reasons. The two most important are:

1. Boosting Search Engine rankings
This affects guest books and forums. The main goal of spammers is to obtain links from other resources. So they put messages with their links in your forums and message boards.
2. Spamming feedback forms to deliver advertisements
This is the same method as spamming mailboxes. Spammers just deliver their advertisements to you using the feedback forms you provide them on your site.

Why does our solution protect from spam?
Spam is not delivered manually. There are many so-called spam robots (bots) which are spidering the web in order to find the form. Whenever such robots find the web form it tries to post a spam message to it. The only solution to protect your form is to add a verification image.

This method will not protect you from spammers that are delivering their spam manually, but it will stop all the spam bots. Statistics show that spam delivered manually is less than 0.01% of all web form spam.

How to:
1. Create account on http://www.protectwebform.com/.
To do this, just go to the registration page: signup and fill in all the fields. The new password will be sent to the email address which you provide.

2. Login to the http://www.protectwebform.com/ with the login name you provided and your new password. Go to the page My Verification Urls and click on the button “generate”. You will see two urls, which will be used to show the image and to verify the code.

3. Click on the link ‘Install’, choose type of installation and follow a few short instructions on that page to install the protection scripts.

1. Update you html file as described on the installation page.
2. (If required) update you code file as described on the installation page.

Take our visual tour on gateway installation: Visual Tour
* You may choose other types of installation. This is the easiest one.

4. If you want to better integrate the verification process into your site, you should know just two things:

1. The first url is an url of the verification image
2. The second url is an url which verifies the code, that was provided while filling in the form. Replace the string ‘__ver_string__’ in that url to the code that the user has provided to you. When quering this url you will get an xml answer saying whether registration was successful.

XML DTD:

< !ELEMENT authorization EMPTY >
< !ATTLIST authorization status NMTOKEN #REQUIRED >
< !ELEMENT protectwebform ( verification, authorization ) >
< !ELEMENT verification EMPTY >
< !ATTLIST verification result NMTOKEN #REQUIRED >

XML Example:

< ?xml version="1.0" encoding="utf-8"?>
<protectwebform>
<verification result="yes"></verification>
<authorization status="1"></authorization>
</protectwebform>

Demo: http://www.protectwebform.com/imagetypes

Source: http://www.protectwebform.com/howprotect