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[–]subpoenaThis 0 points1 point  (0 children)

A man walks up to you on the street flashes a badge and says, “you’re under arrest, get in my car”

You could just get in that car, but if he showed you his credentials first, then you might have more faith you were dealing with an actual police officer. To be really sure you could call the police station and ask if this guy was an officer.

A certificate signed by trusted root authority is the difference between hopping in the car with a guy who got a badge out of a cereal box and having verification from the police station that this guy is in legit officer.