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Re: Re: A little fun with merlyn

by Dog and Pony (Priest)
on Mar 06, 2002 at 08:51 UTC ( #149633=note: print w/replies, xml ) Need Help??

in reply to Re: A little fun with merlyn
in thread A little fun with merlyn

it could potentially be used to circumvent an important PayPal fraud-prevention scheme that uses a GIF with numbers and letters

I must say that I find that highly unlikely. Take a look at Paypal registration to see an example of the images generated - even though I am a firm beleiver that anything can be written in perl, eventaully, this really funny little trick isn't coming close to breaking the paypal images. Nor was it intended to, of course. :)

Reading a character in an image is old news as such, so paypal uses a lot of different "blurring" techniques, such as drawing lines at random intervals, moving the characters inside the image and using a font that is hard to interpret - and probably other things too.

Just so any paypal users can sleep a little tonight...

You have moved into a dark place.
It is pitch black. You are likely to be eaten by a grue.

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Re: Re: Re: A little fun with merlyn
by Improv (Pilgrim) on Apr 04, 2003 at 14:49 UTC
    Interesting. I wonder if it might be possible to use something like a hopfield network to defeat such schemes. Ages ago, I wrote a simple implementation, and it's available here, but that code is probably both ugly and not as algorithmically good as it could be.

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