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Question 1: A Bluetooth device A wants to establish a key with another bluetooth device B. Mechanism 1: they agree upon a common trusted CA,

Question 1: A Bluetooth device A wants to establish a key with another bluetooth device B.

Mechanism 1: they agree upon a common trusted CA, get certificates from this CA and for example, use STS protocol to establish a key

Mechanism 2: they use a physical channel (e.g., an audio channel) to establish a key.

Which of the two mechanisms above adheres better to the principle of economy of mechanism?

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