Random image text generation?

[Hendrik van Rooyen]

From: "Leif K-Brooks" <eurleif at ecritters.biz> wrote:

> Steven D'Aprano wrote:
> > For a text only solution, consider putting up a natural language question
> > such as:
> >
> > What is the third letter of 'national'?
> > What is four plus two?
> > How many eggs in a dozen?
> > Fill in the blank: Mary had a little ____ its fleece was white as snow.
> > Cat, Dog, Apple, Bird. One of those words is a fruit. Which one?
>
> That wouldn't work as a true CAPTCHA (Completely Automated *Public*
> Turing test to tell Computers and Humans Apart), since making the list
> of questions and answers public would defeat its purpose.

you could consider keeping these answers secret - the spammers would then be
stymied...