How does a secure phone line work?

We’ve all seen those corny, binge-watchable spy action series where, upon uncovering a plot, the agent must alert the White House post haste to thwart an imminent attack on the nation. Cue to the horse voice of TV drama “24”‘s star Kiefer Sutherland: “Get me a secure line to the president.” 

But what exactly does that mean? 

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