implementing captcha in Flash

Question

I'm developing a flash registration form and I need to incorporate dynamic 'captcha' images for confirmation. Can anyone recommend a best solution for doing this?

Answer 1

Captcha is used to prevent bots from submitting html forms which is easily accomplished since html is easily understood and processed programmatically. The same is not true for a Flash application. It would be difficult for a bot to generically submit Flash forms if it was not specifically made to target your site.

Therefore you don't need to worry about the spam problem captcha solves when working with a Flash application.

Answer 2

Making a strong captcha is not a trivial task. It must be hard enough for bots to fail, but easy enough for humans to succeed... I would take a look at existing systems and possibly use them. reCAPTCHA is popular http://recaptcha.net/ . It might be possible to use it through flash, but I have not looked into it.