For example, it is familiar to us that most online games will require you to create a password to access to the game. But more interesting, some interactive games could let yourself set a password so that the person who are told about the password by you can access the game, other people can not access. It help people to reserve place in games.
As for private events, I remembered that when I was a child, I wrote a cipher letter to my friend just for fun. It looks a little bit childish now, but we enjoyed it very well. We felt a little bit glory that nobody else know what we talked about. It is beyond keeping secrets.
Have you created such cipher letter since you were born?
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