perplexus.info :: Logic : Box, Locks and Keys

Box, Locks and Keys (Posted on 2003-07-18)

You want to send a valuable object to a friend securely. You have a box which can be fitted with multiple locks, and you have several locks and their corresponding keys. However, your friend does not have any keys to your locks, and if you send a key in an unlocked box, the key could be copied en route.

How can you send the object securely?

See The Solution Submitted by Ravi Raja

Rating: 3.4167 (12 votes)

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Comment on the official solution	broll	2016-04-10 00:06:04
An observation of the 'official' solution (spoiler)	Dej Mar	2008-09-26 07:11:52
This seems too easy, or is it?	Steve	2003-12-17 00:13:06
re: No problem	Jack McBarn	2003-11-11 11:01:06
just a guess	Kelly	2003-08-11 00:13:35
disappointment	nellie	2003-07-27 07:08:11
Solution (Maybe)	Ryan	2003-07-23 16:53:46
think i got it	maddi	2003-07-23 16:32:18
re(4): solution	exoticorn	2003-07-23 00:55:59
Smarty Pants Solution	ryan smith	2003-07-21 23:06:30
re(3): solution	ryan smith	2003-07-21 22:58:28
Depends	Lewis	2003-07-21 20:56:45
re: Possible Solution	exoticorn	2003-07-19 01:24:32
re(2): solution	exoticorn	2003-07-19 01:20:08
re: Possible Solution	TomM	2003-07-18 19:39:45
Possible Solution	DJ	2003-07-18 18:34:01
re: solution	DJ	2003-07-18 18:33:07
No problem	nellie	2003-07-18 09:09:08
solution	exoticorn	2003-07-18 08:05:43

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