Post

David Brooks
@grandpadavid.bsky.social

You can figure out the message by hacking into the power supply and measure the voltage variations. A military team once did something similar as a POC: by monitoring the use of timeslices in their own app on a timeshared computer, they could read the activity of a target app.

Toby Bartels
@tobybartels.name

I spent too long thinking about whether this would actually work, and I decided that greatly slowing down the packet rate like this would at least give you some time to interrupt the transmission if you detect a security breach.

Dr Philip J Naylor
@p1dge0n.bsky.social

Reminds me of the story of a local aircraft works using an infrared network link to an outlying building, to avoid having to dig a trench across the runway. Huge packet loss every time an aircraft took off or came into land.

Bill Stewart
@billstewart.bsky.social

Back in the late 90s I had a classified computer room, and we were looking for a Teletype ASR33 to do verifiable data exports from it using paper tape. DEC referred me to their "Traditional Products Division", but we got a used one from an employee. Current loop, unfortunately, never got it working.