So up to now, you have seen a few examples of captcha:
Captcha used just to protect a page without a form,
and captcha included in the web mail form itself like the example above.
Your captcha knowledge by now should tell you that:
the form without captcha or the so called form-for-dummie-webmasters,
is open to all sorts of fiddling around by bots,
but you have also tested one form which does use captcha along with it,
where the bot may have some difficulty and in most general uses of captcha,
after the manual insertion of the captcha generated image, this form
would have been sent and the webmaster of this web site would have
received the filled in information.
So this is what captcha is all about.
Or most people think so.
Captcha is about preventing bots and their spammer masters hijacking
your forms, using them to spam once or a million times, from filling in forms blindly,
and many other reasons why bots are used.
Bots can mass buy or pre-order tickets for sports or music events,
subscribe for thousands of free e-mail accounts, click thousands
of votes or opinion choice about an article or a website etc. etc.
But implementing captcha in existing forms is a pain in the a$$.
It requires some programming knowledge, at least some php know how,
and also html knowledge.
How can captcha be implemented throughout a website with maybe 5 or
more forms without having to redesign, re program all the existing forms ?
Without php skills ?
Go to part 4 of 6 on understanding captcha:
Click here to find out how to implement captcha in web forms
without having to go and see your psychiatrist the next day.
How to use the Captcha tutorials :
How best to use this captcha website - where should you start from ?
The six part captcha tutorial for beginners:
1 - How to use captcha
2 - Forms without captcha
3 - Forms using captcha - this page
4 - More examples of using captcha in forms
5 - The captcha solution anyone can use on their website
6 - Free Captcha download and implementation of captcha
6a - Captcha for the short sighted - implementation of large readable captcha
More advanced captcha tutorials:
How to insert captcha inside a web form
Captcha for more advanced web masters with some php know-how:
How to modify a captcha image
Online examples of Captcha:
Using captcha Another example of captcha Captcha within a web form Very simple captcha
Fully functional example of captcha and form Large, BiG, GIANT Captcha, with captcha image tweaking options
Contact this website - if you have anything interesting to add
Other captcha information:
Captcha programmer Captcha links to captcha resources
Captcha web site navigation:
Captcha web site map
[ andare qui per tutorial su Captcha in italiano ]