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BusKill – A USB kill cord for laptops

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Re: BusKill – A USB kill cord for laptops

#331
post #7

For the Yubikey owners out there, a while back I wrote a blog post on how to achieve a similar setup using a Yubikey [1]. All it requires is a lanyard to attach the yubikey to. [1]: https://tbabej.com/Yubikey-secure-session-setup/

Once you’ve lost your yubikey, you have to reboot as root then?

Is it possible to register 2 keys, so that any of them is correctly recognised?

Re: BusKill – A USB kill cord for laptops

#332
post #175

Earlier quoted context omitted.

I disagree. I this this sounds a little too much like a TV show like 24. The idea that you could completely immobilize someone at a public library so rapidly and without their awareness that they could not even move their arm 20 cm or so during a struggle seems ludicrous to me. Particularly as the kind of person who would buy this device would be setting themselves up with their back to the wall to prevent captures f…

I think you have way too much faith in the reasonableness of law enforcement. There are 20K no-knock raids in the US every year, a significant percentage at the wrong address or clearly innocent people.

Did you reply to the wrong comment?

This device is indeed clearly designed for a no-knock raid situation, or other surprise grab.

I'm simply saying that, if you're attached to your laptop by a 50cm cable, which of you separate your arm further than that from will lock your computer, it will be very difficult for the agents to guarantee you won't be able to lock your computer.

Re: BusKill – A USB kill cord for laptops

#333
Reminds me of the story of the arrest of Ross Ulbricht, where his open laptop was snatched away from him in a library by undercover FBI agents, while logged in and chatting as DPR. I recommend reading the whole story, this is in part 2 (https://www.wired.com/2015/05/silk-road-2)

DPR is Dread Pirate Roberts from Silk Road.

“What unfolded next was a piece of improvisational theater. At 3:14 pm, DPR was typing away, writing to Cirrus. Just then, a middle-aged woman and man came toward Ross, ambling along in the kind of semihomeless shuffle you might often see in a San Francisco library. “Fuck you!” the woman yelled when they were directly behind Ross’ chair. As if they were a deranged couple about to fight, the man grabbed the woman by the collar and raised his fist.

Ross turned around for just a second, during which a hand reached across the table and grasped Ross’ Samsung. The petite, unassuming young Asian woman sitting across from Ross this whole time was, to everyone’s surprise, also an FBI agent. Ross lunged for his machine, a hair too late, as she turned like a quarterback for a quick handoff to Kiernan, who appeared out of nowhere—as instructed—to get the laptop. It took less than 10 seconds. From afar, Tarbell was astonished by the elegant choreography of the whole thing. It looked like the police procedural version of a tight jazz quartet.”

Re: BusKill – A USB kill cord for laptops

#334

Earlier quoted context omitted.

Blackberry required you to enter the word "Blackberry" after the fifth try, which would at least prevent butt-dialing from wiping the device. Some kids might figure that out too, but at that point I suppose you had the choice to use a condom and decided not to...

Here a story. I got BB RIM 850 when I was 15ish years old, it was my first communication pre-smartphone device. I stupidly set up to wipe my blackberry if input incorrectly after a few times, and I did this within minutes of first time using it. You can imagine what happened in the next 10 minutes... Yes, I forgot my complicated password and it got wiped. And that rendered my brand-new RIM 850 useless. So, I have to…

Useless? Perhaps the functionality changed later; when I used one, entering the password wrong 10 times was the easiest way to factory-reset the device prior to handing it to a new owner. It wasn't useless, just palimpsest.

Re: BusKill – A USB kill cord for laptops

#335
post #172
post #73

Earlier quoted context omitted.

I'm getting closer and closer to this reality... iphones are basically there, with icloud backup. Have been trying to get less attached to any OS installs, and be fast at building up from a fresh install. Seems hard to even trust your own desktop after a while.

Is this convenience worth sending unencrypted backups of your data to Apple? Do they allow truly offline backup and restore?

For most people, availability is the key part of security instead of confidentiality, since for them losing their data is both much more likely and much more painful than someone getting a warrant to take their data from Apple.

Re: BusKill – A USB kill cord for laptops

#336

Earlier quoted context omitted.

Having a USB kill switch in this case could (would?) have escalated the arrest method to something more violent.

It's probably better to be beat up or tortured by a state actor than to rot in prison for the rest of your life if they get hands on proof of your culpability. Besides the USA is not Al Qaida, there is a chance they would respect the Geneva convention: https://ccrjustice.org/home/get-involved/tools-resources/fac...

If your kill switch manages to destroy evidence, that's generally obvious and has two consequences.

First, intentionally hiding or destroying evidence of a crime is itself a crime (self-incrimination is restricted only to verbal statements) of which you can be convicted even if you're not guilty of the original accusation;

Second, destroying evidence in this manner enables the legal concept of 'adverse inference' where essentially the judge can require the jury to assume that the destroyed evidence did contain whatever prosecution wanted to find there, and convict you based on that.

Re: BusKill – A USB kill cord for laptops

#337

Earlier quoted context omitted.

https://docs.microsoft.com/en-us/windows/win32/api/winuser/n... EWX_FORCEIFHUNG 0x00000010 Forces processes to terminate if they do not respond to the WM_QUERYENDSESSION or WM_ENDSESSION message within the timeout interval. For more information, see the Remarks. If the EWX_FORCEIFHUNG value is specified, the system forces hung applications to close and does not display the dialog box.

If forced shutdown is a priority, causing a bugcheck would probably be your best bet. This could be part of the USB driver for the device, or you could write a piece of software running as admin to trigger a fail state (like killing wininit or any other critical part of Windows). You'd have to watch out that you don't let the system store a memory dump, of course, that'd be the exact opposite of what you want.

Not a battery flat state?

Re: BusKill – A USB kill cord for laptops

#338

Earlier quoted context omitted.

Honestly, that sounds a little too "CSI". If the lanyard is attached to a wrist, the chance that someone could be suddenly incapacitated in such a way to avoid a jerky movement that breaks the connection is pretty small. "Knock them unconscious" is a TV trope.

What about "pin his hands to the table" while the nerds exfiltrate the data?

But if you even notice the (thin, dark?) bit of cord between a guy's wrist and laptop computer when he's working on it at a table in the library, wouldn't your first assumption be that he's a bit paranoid about having it stolen and therefore has strapped it to himself by the Kensington Lock slot? So you'd be quite OK with stretching it as far as it goes -- only noticing later that in this case you could "stretch" it beyond that, popping out the USB connector. (Actually, wouldn't a lot of people in a position to do this be only too happy to give it an extra forceful yank, just to hurt the Eevul Hacker?)

Re: BusKill – A USB kill cord for laptops

#339

This is shockingly expensive and comically impractical to use.

$89 doesn't seem that expensive. It's just as impractical as money belts, key chain alarms, Tiles(tm) I mean, too impractical for me, but there is definitely a market for it.

$89 for a USB cable with a magnet? Are you serious?
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