In spy movies they ask, if one is on a secure line? What is that? Can Theoretically any communication channel could be eavesdropped?
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Secure line typically means that it is encrypted in some way. Even if someone is listening directly into the call via a tap, all they would hear is gibberish.
Back when phones were analog, you could put an encrypted scrambler on the phone and again it would make what ever you say sounding like a buzzing.
Now a days, you can do similar stuff with software.
Now with the Patriot act. The U.S. Collects a ton of voice and text message data, but it is almost impossible to weed through it all.
Another definition of a secure line is picking up a burner phone or using a phone that the chances of it being tapped are zero. Like borrowing a phone at a gas station in the middle of nowhere.
Hence why it is always better to bug the room someone is calling from then the device itself.
Although you don’t get both sides of the conversation, you at least get enough information to make a professional judgement.
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