New Attack Recovers RSA Encryption Keys from EM Waves Within Seconds

This HN thread links to the original paper: https://news.ycombinator.com/item?id=17817966

Why can't the silicon be encased in metal? Thermal reasons? Problems passing the wires through?

reminds me of this:

RSA Key Extraction via Low-Bandwidth Acoustic Cryptanalysis

https://m.tau.ac.il/~tromer/acoustic/