Posted by boclair on 06/18/06 12:03

Beat wrote:
> hello
>
> i implented a turing check on a friends guestbook. he had several spam
> entries a day lately. now a couple hours after i activated this, there's
> again a spam-entry in there.
>
> do you think the turing number could be readable by bots? (i changed the
> script a bit, the number was barely readable by humans before...)
> http://www.bigpoint.ch/s_eintrag.php
>
> or are sometimes also humans making those entries? does anybody now the
> approximate percentage of humans and bots making theses entries? other tips
> how to cope with this?

One way may be to prevent the update of the database (or flat file)
after the form is submitted, for example, roughly

if (
((substr_count($name, 'ronaldino')==0))

AND ((substr_count($email, '.br')==0))

AND ((substr_count($message, 'football')==0))
AND ((substr_count($message, 'fifa')==0))
){
/*update database or write to file*/
}

Louise

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