this post was submitted on 02 Dec 2023
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Researchers in the UK claim to have translated the sound of laptop keystrokes into their corresponding letters with 95 percent accuracy in some cases.

That 95 percent figure was achieved with nothing but a nearby iPhone. Remote methods are just as dangerous: over Zoom, the accuracy of recorded keystrokes only dropped to 93 percent, while Skype calls were still 91.7 percent accurate.

In other words, this is a side channel attack with considerable accuracy, minimal technical requirements, and a ubiquitous data exfiltration point: Microphones, which are everywhere from our laptops, to our wrists, to the very rooms we work in.

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[–] [email protected] 102 points 11 months ago (3 children)

New policy from the corporate office: If you are working in a public place, like a coffee shop, please scream while typing your login password.

[–] [email protected] 48 points 11 months ago

I screamed my password and now I got hacked. Thanks for nothing!

[–] [email protected] 10 points 11 months ago

use the onscreen keyboard

much more secure

why won't my bank stop calling me

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[–] [email protected] 91 points 11 months ago (2 children)

Quite scary considering the accuracy and how many open mics everyone is surrounded by without even realizing it. Not to mention if any content creator types their password while live streaming or recording they could get their accounts stolen.

[–] [email protected] 47 points 11 months ago (7 children)

One more reason to switch to a password manager, even though they could still find out the master password…

[–] [email protected] 30 points 11 months ago (1 children)

Probably still have some safety if you're using two-factor, or have a master key in addition to a password (e.g. 1Password).

[–] [email protected] 13 points 11 months ago* (last edited 11 months ago) (1 children)

Or use a local password safe like keepass.

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[–] [email protected] 15 points 11 months ago* (last edited 11 months ago)

This has been a known attack vector for years, and I wonder how no livestreamer has been (publicly) attacked in this way.

I guess in large part this can be attributed to 2FA, passwords just aren't worth much by themselves anymore (well I guess if someone is quick enough they can snipe the OTP as well, but streamers are rarely entering their 2FA while streaming since they're on a trusted device).

In fact the biggest attack vector I'd worry about is the infamous SMS 2FA, which is actually 1FA for password resets, which is actually 0FA "yes dear phone operator I am indeed Mister Beast please move my phone number to this new SIM".

[–] [email protected] 90 points 11 months ago (2 children)

Use a speech to text and they won't be able to hear your keyboard strokes. I know, I'm a genius.

[–] [email protected] 27 points 11 months ago (1 children)

Who are you, who are so wise in the ways of science?

[–] [email protected] 16 points 11 months ago (2 children)
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[–] [email protected] 83 points 11 months ago* (last edited 11 months ago) (1 children)
[–] [email protected] 61 points 11 months ago (4 children)

Neat, so when my friends are taking about satisfyingly clackety keyboards I can inform them it’s a security hazard.

[–] [email protected] 38 points 11 months ago

I'll accept the risk. I need the clicky

[–] [email protected] 12 points 11 months ago (2 children)

Good luck, I have a non standard key layout

[–] [email protected] 10 points 11 months ago (7 children)

It's still vulnerable to dictionary attacks

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[–] [email protected] 43 points 11 months ago (3 children)

Not to be a jerk, but is this actually new? I've heard of this being done at least ten years ago...

On another note, one way to beat this (to a degree) would be to use an alternate keyboard like Dvorak (though you could probably code it to be able to detect that based on what's being typed)

[–] [email protected] 24 points 11 months ago (5 children)

I think it's largely been a state actor thing. Directional microphone to record your window from across the street, spend significant tax money on crunching numbers on a supercomputer to get at your password kind of thing, I think they already could do it in the 90s. Real-time 95% accuracy on a non-specialised device is a quite different ballpark: Now every skiddie can do it.

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[–] [email protected] 20 points 11 months ago (2 children)

Coding for alternate key mappings is almost as trivial as detecting other languages.

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[–] [email protected] 14 points 11 months ago (2 children)

There has been previous work on this, yes. It required a dictionary of suggested words. That would make it useful for snooping most typing, but not for randomly generated passwords. This new technique doesn't seem to have that limitation.

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[–] [email protected] 43 points 11 months ago (2 children)

This is why I always make sure there are no boffins around before I start typing.

[–] [email protected] 13 points 11 months ago* (last edited 11 months ago)

If there are boffins around, I start typing out the GDPR guidelines in full

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[–] [email protected] 41 points 11 months ago (1 children)

I think I might have achieved security through obscurity. My custom keyboard is a unique shape and almost all the keys are one unit. Not only is it different enough from a traditional keyboard that the neural network probably won't understand it, the function layers I use obscure whether I'm typing a letter at all.

[–] [email protected] 35 points 11 months ago (5 children)
[–] [email protected] 21 points 11 months ago (2 children)

Does that come with free fingerless gloves?

[–] [email protected] 15 points 11 months ago (4 children)

No, but it comes with your choice of flavoured frozen yoghurt.

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[–] [email protected] 30 points 11 months ago

I guess my typos are now a security feature!

[–] [email protected] 25 points 11 months ago (3 children)

I wonder if you need to train it on a specific keyboard before it will work it.

[–] [email protected] 12 points 11 months ago (1 children)
[–] [email protected] 11 points 11 months ago (1 children)

That would limit the practicallity quite a lot, as deskmats and typing style would change the sound of even a common keyboard.

I also notice that I slightly change my typing style between typing normally and entering my password.

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[–] [email protected] 24 points 11 months ago (1 children)

I'd be curious how well this approach translates to multi-lingual keyboard layouts. For english users, perhaps theres another benefit to non-QWERTY layouts (e.g. Colemak or Dvorak) after all? ... and two factor authentication should remain helpful I presume. Especially physical key methods with no audible characters typed (e.g. Yubikey, Titan, etc.)

[–] [email protected] 27 points 11 months ago

I was thinking the same, but it would be trivial for software to realize that “fnj xlg” maps to “the dog” with Colemak or Dvorak.

[–] [email protected] 19 points 11 months ago (11 children)

Can we normalise good but quiet keyboards. Like, I like the tactile feel of using a mechanical, but I hate the sound. Quieter mechanical keyboards aren't a thing but they should be. Now as a security measure if nothing else.

Also Dvorak keyboards I guess

[–] [email protected] 21 points 11 months ago (2 children)

There are tons of quiet mechanical keyboards. I'm using a low profile optical switch that's quieter than my mouse clicks

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[–] [email protected] 15 points 11 months ago (1 children)

There are definitely quiet tactile switches. The reason why they can still make sound is because they’re bottoming out which you don’t have to do.

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[–] [email protected] 11 points 11 months ago* (last edited 11 months ago)

Dvorak is a cypher of Qwerty tho. Anything typed in Dvorak but transcribed as english can be reliably identified and decyphered

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[–] [email protected] 16 points 11 months ago (5 children)

Some laptops like the Framework laptop have fingerprint sensors

Physical Security keys like NitroKeys or YubiKeys are another option

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[–] [email protected] 13 points 11 months ago* (last edited 11 months ago) (1 children)

I never learned to touch-type, so my typing style is very different from most people though I can type fast enough for work.

My typing style only uses 3 fingers, and both hands type keys in the middle of the keyboard.

I wonder if this has any effect on accuracy?

Edit: Article states touch-typing can reduce accuracy. Wonder if that's because they type more softly than us tech gorillas who tend to bash on the keys?

[–] [email protected] 9 points 11 months ago (6 children)

I'm a touch typist who can reach 160wpm when I'm really flowing, I would guess the speed makes accuracy harder to distinguish individual keys than you pressing keys with three fingers.

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[–] [email protected] 12 points 11 months ago

I wonder if different switches, keycap profiles, keyboard material ect affect the accuracy?

[–] [email protected] 10 points 11 months ago

How good does this work if there's other noise pollution? Like music playing etc?

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