1Predict.
Pick what you think the watcher at the window will see.
Day 2 · Keys on the move
Who Holds the Key
Who can see your message on its way?
Five trials. In each one, predict what one watcher can see, send the message through the tube and look through the window. Then change one protection and compare.
Day 2 · The lesson and this game
Who holds the key decides who can read it.
Encryption protects data in different places: on a connection, between people in a chat or on a locked device. Who holds the key helps decide who can read it.
Follow one watcher at a time. Predict what it can see, send the message and look through its window. Then change one protection and compare.
How to play
2Send and look.
Send the message. It moves through the tube, and the window shows what the watcher sees.
3Change one protection.
Flip one switch beside the sending device, send it again and compare.
Every person, app and message here is made up. Real apps differ in what they record, so check an app's privacy settings before you trust it.