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X account @gakonst recalled that they first learned about cross-device tracking similar to the television-related finding at a presentation by a university security group in Greece. They said advertisements would embed ultrasonic beacons to measure listening duration.
the first time i became aware of cross device tracking similar to the things ppl have been finding about their tv was @mavroudisv’ presentation at the security group i was running at uni in greece where ads would embed ultrasonic beacons to figure out how much you have listened to the ad - their dog could hear it tho!
https://t.co/7biHlfDbsU
the first time i became aware of cross device tracking similar to the things ppl have been finding about their tv was @mavroudisv’ presentation at the security group i was running at uni in greece where ads would embed ultrasonic beacons to figure out how much you have listened to the ad - their dog could hear it tho!
https://t.co/7biHlfDbsU
The following is analysis, separate from reported facts. Verify important claims independently.
This is an X user's recollection of past experiences and technical practices, without independently verifiable presentation materials or research evidence; it has no direct connection to the monitored assets.
Verify the conditions for follow-up on this event: whether the relevant presentation, research paper, or original technical materials can substantiate the specific implementation and scope of use of ultrasonic beacons.
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