[SGVLUG] Security riddle

[Mike Rubel]

Is there any worry about a "man in the middle" intercepting the original
shipment and replacing your open lock with his own?  (Then replacing the
recipient's lock in the return shipment, and so forth?)

> Send the unlocked box with one of your locks. the recipient places his
> lock
> inside and locks the box with your lock. You unlock the box with your key,
> put the item in the box and lock the box with his lock. he unlocks it with
> his key.