Secure Spy Transfer

You are a spy and need to send an item to a contact in another country without letting anyone else have access to it. All unlocked items will be opened in transit. How can you send this item securely?

Place a lock on the item and send it to your contact. They will place their own lock on the package and return it to you. You remove your lock and send it back. When they receive it, they can unlock the package and retrieve the item.

Posted in Brain Teasers


5 Comments on "Secure Spy Transfer"

Sheldon says
May 14, 2014 @ 15:20

Today, I went to the beachfront with my kids.
I found a sea shell and gave it to my 4 year old
daughter and said “You can hear the ocean if you put this to your ear.” She put the shell to her ear and screamed.
There was a hermit crab inside and it pinched her ear.
She never wants to go back! LoL I know this is completely off
topic but I had to tell someone!

Dan says
May 14, 2014 @ 16:19

@Sheldon You’re not kidding about being off-topic :)

Ramón says
April 17, 2015 @ 19:24

Umm… Why not just send the key separately? :-) I think this question should add “No-one is allowed to send across any keys.”

Dan says
April 19, 2015 @ 21:47

I see what you’re saying. The assumption is sending the keys isn’t secure.

Matthew m Estrada says
August 23, 2019 @ 12:27

New to this what key?

Leave a comment

First name (required)

Email (will not be published) (required)