Re: Where's Waldo? (challenge)

[der Mouse <mouse () rodents montreal qc ca>]

>     You and a friend play "Where's Waldo?". You solve the puzzle before
>     your friend, and you want to prove to your friend you solved the
>     puzzle, without giving him any hints. How do you do this?"

I don't think I do.  I don't think this is possible without introducing
third parties, or a rather severely nontraditional form of "Where's
Waldo?".  Everything I can think of can be spoofed, such as with an
auxiliary picture of Waldo....

The closest I think I can come is to give him a data blob with which I
can "prove" that, when I generated it, I knew the answer - but to do so
I have to reveal the answer (if he doesn't already know it).

> http://www.algorithm.co.il/blogs/index.php/math/where-is-waldo-or-security-by-origami/
> http://www.algorithm.co.il/blogs/
> http://blogs.securiteam.com/index.php/archives/917

I don't see anything there that allows you to demonstrate that you know
the answer to someone who doesn't know the answer, without revealing at
least part of the answer.

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