The "free internet with no mobile data plan" seems a stretch, unless you consider the speed ok.<p>> Bräunlein reported that he could send at about 20 bits/second and receive at about 25 bits/second, but that his hidden data “messages” took anywhere from a minute to an hour to arrive.
The blog post [0] of the researcher - which this article is based on<p>[0] <a href="https://positive.security/blog/send-my" rel="nofollow">https://positive.security/blog/send-my</a>
<i>If you mock up AirTag broadcasts using one and only one of those messages as a public key, and you send it many times to improve its chance of getting through, I can figure out which hidden message you sent by working out the SHA256 hashes of all possible 100 messages…</i><p>Would this be the equivalent of using a one time pad?