I was watching American Assassin the other day and it got me thinking. When the team is in country and at the hotel, their team leader is out side in a car, and the two operatives are in the hotel. They use a simple app where the TL presses the screen and the team members respond to check in. This method is a digital take on the tried and true methods of challenge and response and check in windows.
Depending on your situation you might want to be able to check in with your team regularly without drawing any attention to your self visually like this. But how to do it securely and not have to home bake an app from scratch?
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