Secret Mail Puzzle - Solution
The Puzzle:
But Sam, who you don't trust, has access to all your mail.
So you put your message in a box with a lock.
But you are not allowed to send a key!
How can you get your message through securely?
Our Solution:Send the box with the lock to Alex.
Alex can't open it, but can put another lock on the box.
Alex sends this box with the 2 locks back to you, you unlock your lock and send it back to Alex again.
So there is just Alex's lock on the box and Alex can now open it.
Alex can't open it, but can put another lock on the box.
Alex sends this box with the 2 locks back to you, you unlock your lock and send it back to Alex again.
So there is just Alex's lock on the box and Alex can now open it.