Office Riddle 05-09-11

May 9th, 2011

Love in Kleptonia:

Jan and Maria have fallen in love over the internet and Jan wishes to mail Maria a ring. Unfortunately, they live in the country of Kleptopia where anything sent through the mail will be stolen unless it is sent by padlocked box. Jan and Maria both have plenty of padlocks, but none to which the other has a key.

How can Jan get the ring safely into Maria's hands?

Keywords:
riddle,puzzle

5 replies

On May 9th, 2011 18:26 Jason wrote
So he locks it in a box and sends it to her. She puts another lock on it and sends it back to him. He takes his lock off and sends it back to her. She removes the lock she added and then opens the box to discover the ring doesn't fit and the diamond is not the right cut.
On May 9th, 2011 19:31 Jerry wrote
Maria must send her hands to Jan. Her fellow Kleptonians will be too grossed out to steal these from the mail. When Jan receives them, he can safely put the ring in them. However, he might reconsider marrying a handless woman. Seriously, since the set up says ANYTHING sent in the mail is stolen, even a locked box will be intercepted. Jan must find an alternate means of transport.
On May 9th, 2011 19:32 Jerry wrote
oops - didn't read the unless clause...
On May 11th, 2011 13:48 Alan wrote
Maria calculates two extremely large prime numbers and multiplies them together to form a composite number. She uses these numbers and the RSA algorithm to form a public and private key. She mails the public key to Jan in a regular envelope. Jan then uses a COMBINATION lock to which only he knows the combination, and sends the ring padlock-protected by the combination lock. He sends a separate envelope with the padlock combination, which he has encrypted with Maria's public key. Only she will be able to decrypt the padlock combination and open the ring box.
On May 11th, 2011 15:29 Daniel wrote
Pubkey gets stolen in route.
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