This HN thread links to the original paper: <a href="https://news.ycombinator.com/item?id=17817966" rel="nofollow">https://news.ycombinator.com/item?id=17817966</a>
reminds me of this:<p>RSA Key Extraction via Low-Bandwidth Acoustic Cryptanalysis<p><a href="https://m.tau.ac.il/~tromer/acoustic/" rel="nofollow">https://m.tau.ac.il/~tromer/acoustic/</a>