This model is applicable in the scenarios where devices are capable of using another technology like NFC. It is called Out of Band mechanism to discover both devices as well as to exchange cryptographic numbers. The model provides security from MITM attacks. The practical example of this model is NFC-based connection between a cellular phone and a Bluetooth headphone. The user needs to touch the headset in order to pair it with the phone.
Out of Band (OOB)
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