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.
The article says
Hm. Sounds like “some cases” are hunt and peck typists or very slow touch typists.
I don’t know if training for each victim’s typing is really needed. I get the impression they were identifying unique sounds and converting that to the correct letters. I only skimmed and I didn’t quite understand the description of the mechanisms. Something about deep learning and convolution or…? I think they also said they didn’t use a language model so I could be wrong.
The problems is that even with up to 95% accuracy that still means the with a password length of 10 there is a 50/50 chance that one character is wrong.
A password with one character wrong is just as useless as randomly typing.
Which character is wrong and what should it be? You only have 2 or 3 more guess till most systems will lock the account.
This is an interesting academic exercise but there are much better and easier ways to gain access to passwords and systems.
The world is not a bond movie.
Deploying social engineering is much easier than this sort of attack.
“Hearing” the same password twice drastically increases the accuracy, however, social engineering is indeed the most effective and efficient attack method.
If the password is not random, as they seldomly are, you can just guess the last, or even the last few characters of they are not correct.
Have you never seen a Bond movie? Yeah they always have a gadget or two, but the rest is basically him social engineering his way through the film. And shooting. Usually lots of shooting too.
I was thinking of this attack in terms of grabbing emails, documents, stuff like that. Or snippets thereof.
I imagine it probably also uses an algorithm to attempt to “guess” the next letter (or the full word itself, like your phone keyboard does) based on existing words. Then maybe an LLM can determine which of the potential words are the most likely being typed based on the context.
I dunno if that makes any sense, but that’s how I pictured it working in my brain movies.