Human validation with an image

[DrPike]

Hi guys,

I'm a new python user so I haven't a deep experience in.

The problem: I need to manage thousands of registration form for an
incoming congress, and I need to avoid spambots.

The idea should be to send a light image containig an alphanumeric
string, with a bit of manipulation (eg. bkground noise, distortions
and so on) in order to make a possible interpretation by humans but
programs.

I saw something of similar in the phpnuke User's Login block (Security
Code),
(http://www.phpnuke.org ).

May someone help me?

Tnx in advance,
-- DrPike --