Systems and methods for mutual authentication of electronic devices

An electronic device configured to mutually authenticate to an additional electronic device, comprising:

• a communication module configured to connect the electronic device to the additional electronic device via a communication channel;
• a speaker configured to output audio;
• a microphone configured to detect audio;
• and
• a processor interfacing with the communication module, the speaker, and the microphone, and configured to:
• receive, from the additional electronic device via the communication channel, a request to output a first audio signal at a specified time,
• cause the speaker to output the first audio signal at the specified time, the first audio signal detectable by the additional electronic device,
• receive, from the additional electronic device via the communication channel, a first estimated distance between the electronic device and the additional electronic device, the first estimated distance calculated by the additional electronic device based at least in part on the specified time,
• receive, via the microphone, a second audio signal output by the additional electronic device,
• record a receipt time corresponding to when the second audio signal is received,
• calculate, based at least in part on the receipt time, a second estimated distance between the electronic device and the additional electronic device, and
• compare the first estimated distance to the second estimated distance.