Florent Daigni?re (NextGen$) wrote:
>    * if we use a capcha, the script will ask the user what's written
>       on the img ;)

I'm not sure whether a script can read the contents of an iframe that 
comes from a different domain - in general the browser's supposed to 
prevent that sort of thing, but there *might* be a loophole if the 
contents of the iframe were originally loaded from the same domain as 
the script domain and then redirected to another domain by submitting a 
form.

Assuming the script can't read the contents of the iframe, the form 
could contain a hidden field with a random, unguessable value that must 
match when the form's submitted.

Cheers,
Michael

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