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love in kleptopia


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John and Mary have fallen in love. John wants to send Mary a ring through the post but in their country of Kleptopia, any package that is not locked will have its contents stolen. John and Mary have plenty of padlocks but neither has the other's key. How can John get the ring safely to Mary?

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Should be:

 

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This is a subject in cryptography

A don't want to send his key to B.
B also don't want to send his key to A.
But they want to communicate in insecure Internet connection.
So they have to use an encryption method which work like this.
Only commutative encryption method can answer this problem.

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Should be:

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Yep, sorry. I forgot to use Spoiler, and the "edit post" button disappeared on me.

I have a hard time understanding the 2nd one... I'll think about it a bit more - I suppose a play on words would be a poor answer.

Edited by The_unbeliever
Edit: I take it that's because I've submitted an "answer", not a regular post....
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