Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Type in Morse code by repeatedly slamming your laptop shut

github.com

Post reply on HN
Print view View original

41–50 of 168 posts

Re: Type in Morse code by repeatedly slamming your laptop shut

#41

Post by anfractuosity »

linsomniac wrote: post #36

This reminds me of that section in the book Cryptonomicon, where our hero is programming on a laptop that he knows is being spied upon using Tempest and probably more, and is using clandestine input via morse code on the shift (?) key. I really enjoyed that book.

I think it was something to do with one of the keyboard keys with an LED if I recall correctly, so possibly caps/numlock.

Edit: seems I'm misremembering, just read - https://www.reddit.com/r/programmerchat/comments/3aknvw/pris... the LED was to output data, but they used another key to tap code

Re: Type in Morse code by repeatedly slamming your laptop shut

#42

Post by mulmen »

linsomniac wrote: post #36

This reminds me of that section in the book Cryptonomicon, where our hero is programming on a laptop that he knows is being spied upon using Tempest and probably more, and is using clandestine input via morse code on the shift (?) key. I really enjoyed that book.

> on the shift (?) key.

Disabling Windows accessibility features is an indication of anti-social behavior.

Re: Type in Morse code by repeatedly slamming your laptop shut

#44

Post by anfractuosity »

Haha. Tangentially - https://en.wikipedia.org/wiki/Send_Me_to_Heaven -

"developed by Carrot Pop which measures the vertical distance that a mobile phone is thrown. Players compete against each other by seeking to throw their phones higher than others, often at the risk of damaging their phones."

Re: Type in Morse code by repeatedly slamming your laptop shut

#46

Post by th0ma5 »

shreddit wrote: post #12

It even works offline, just slam harder for “over the air” transmission. Has a shorter range though…

There is a video of a guy shouting into a can which was changing the pressure of a piezo ... I think they picked it up in the shack but didn't mess with it much more. Completely passive I think.

Re: Type in Morse code by repeatedly slamming your laptop shut

#50

Post by xp84 »

mulmen wrote: post #42
linsomniac wrote: post #36

This reminds me of that section in the book Cryptonomicon, where our hero is programming on a laptop that he knows is being spied upon using Tempest and probably more, and is using clandestine input via morse code on the shift (?) key. I really enjoyed that book.

> on the shift (?) key. Disabling Windows accessibility features is an indication of anti-social behavior.

? even on one's own computer? I don't follow

It would follow from your statement that not disabling the screen lock is also anti-social.

Post reply on HN