[thelist] Security code images
Richard Davey
rich at launchcode.co.uk
Tue Aug 3 09:12:34 CDT 2004
Hello Jono,
Tuesday, August 3, 2004, 3:01:10 PM, you wrote:
J> That means that an image (png) appears, and as far as I know, "machines"
J> cannot read images, only text. I am only assuming here. Am I way off on
J> this?
>> Interesting article. It intrigued me enough to play a bit. I can't
>> quite come up with the best way to distort the image to make it
>> difficult to read by machines. I tried arcs and dashed lines, both
>> with some degree of random placement.
There is another way - instead of scrambling a code and telling the
user to "type in what you see" - you could show a picture, of say 3
rabbits and say "how many rabbits do you see?". The user types in 3
(obviously!).
It's a simple example, but you can see the subtle difference. No
script could ever accurately determine what is or isn't a rabbit in a
photo.
Needless to say, they don't have to be rabbits :)
Best regards,
Richard Davey
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