02014. Message delivery
difficulty ·answer type: strategy·✓Not solved
Problem
You need to communicate with your colleague in Greenwich via a messenger service. Your documents are sent in a padlock box. Unfortunately the messenger service is not secure, so anything inside an unlocked box will be lost (including any locks you place inside the box). You and your colleague each have only one key which the person owning the lock owns. How can you securely send a document to your colleague?
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