Human validation with an image

Anton Vredegoor anton at
Sat Feb 21 01:19:37 CET 2004

Peter Hansen <peter at> wrote:

>Other options?  Or pointers to the right keywords to let someone 
>investigate the state of the art/literature more closely?

One idea might be to ask the user to answer a specific computing
intensive question, for example solving a randomly generated traveling
salesman problem of a suitable size. The idea behind this is that a
spammer wants to send thousands of messages and can't afford to
compute the answer to these questions thousands of times, while a
single user can afford to let his computer chew on a problem for a few

I would be interested in a Python implementation of this mail
validation scheme.


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