Presumably WiFi hijacking would get you access to a lot of systems at a lot of places, but it does seem like the most intriguing targets (and those most hardene

Presumably WiFi hijacking would get you access to a lot of systems at a lot of places, but it does seem like the most intriguing targets (and those most hardened against other attacks) are least likely to be susceptible. But now I wonder how many other attacks can be launched from a sealed box in a mailroom. Van Eck phreaking will get you a decent image off an LCD monitor from 10+ meters away through multiple interior walls, and can survive significant channel noise. Other side-channel attacks can directly pick up keys during decryption, though the proofs are short-range and it's not clear whether increasing device size/power would boost that. It'd be tricky and expensive to arrange, especially with the risk of ending up pointed in a boring direction. But it seems like an absolutely wild idea for remote access to the contents of even air-gapped monitors.