If the images can be generated easily by the server and require (for example) an order of magnitude more computing power to decode then this will act as a deterent, since the spammers will require expensive hardware to get a resonable rate, and if they can only send spam slowly then they can quickly be identified and more active measures can be taken (IP blocks, thumbscrews etc.)
Mattias Campe wrote:
You don't have to stick with numbers and letters. A picture could also be send, while the server asks (...through jabber:x:data?):
"What do you see on the picture?" A) A child playing with a ball B) A horse C) A glass of milk
That to-fake-script will probably be a bit harder to write :p.
Mattias
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