Jan 22, 2009 #1 R Ross Member Joined Jun 2, 2008 Messages 146 Reaction score 0 Points 16 Two friends, Denis and Léo wish to communicate by mail. The mailman is dishonest. He steals. Each of the two friends has his own lock and key. They put their mail in a secure box. Question: How can Denis send a letter to Léo without the mailman opening the box?
Two friends, Denis and Léo wish to communicate by mail. The mailman is dishonest. He steals. Each of the two friends has his own lock and key. They put their mail in a secure box. Question: How can Denis send a letter to Léo without the mailman opening the box?