this is called CAPTCHA
there are several libs: e.g. JCAPTCHA

On Aug 6, 4:04 pm, Krysgian <k.vantass...@gmail.com> wrote:
> Could someone point me in the right direction to an implementation in
> Java (or gwt, ext, etc.) where a box is displayed showing an image of
> characters which must be typed correctly in order for the requested
> function to be successful?
>
> Thanks!
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