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[tweaktown] Security researcher creates USB stick that can fry any USB device - Page 4

post #31 of 36
Quote:
Originally Posted by Sin0822 View Post


Please don't ever try this, but DC can kill if it breaches you skin. About 100-150ma to stop the heart, and a DMM on doide mode should be able to produce that much if each probe breaches the skin. You skin has about 1mohm resistance so most DC currents don't bother us, your blood is salty and quite the conductor.

30mA IS deadly, hence the differentials they place in the beginning of an elektrical household installation (at least in Belgium you have to place a 0.03A first and 0.3A 2nd or sometimes a 0.1A.

But that is IF the voltage is high enough to short with the ground. Only then (when loop is closed) a current can run.

You can have Voltage without current, but you cannot have a current without voltage (unless a special labo designed currentsource...)
   
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post #32 of 36
Quote:
Originally Posted by ASUSfreak View Post

And how did you do that? People don't conduct 12V... unless your finger was wet... (but spare the details if it was wink.gif )

I don't know exactly. I can only guess it had something to do with the dense little bank of surface resistors just above the graphics card I was tweaking. I'd just installed an active heatsink on it and was probably determining which fan outlet I had better control over.

The point is, this is the most over engineered metal strip or wire I've ever seen.
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post #33 of 36
Quote:
Originally Posted by un-midas touch View Post

I don't know exactly. I can only guess it had something to do with the dense little bank of surface resistors just above the graphics card I was tweaking. I'd just installed an active heatsink on it and was probably determining which fan outlet I had better control over.

The point is, this is the most over engineered metal strip or wire I've ever seen.

Ah! You prolly shorted it with this metal piece wink.gif or it's conductive TIM.
   
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post #34 of 36
So what's the difference between this and an iPod? Frying a bus master for a USB isn't frying the computer BTW.
post #35 of 36
Quote:
Originally Posted by ASUSfreak View Post

Ah! You prolly shorted it with this metal piece wink.gif or it's conductive TIM.

Nah that was already in place. I knew enough not to try and do that while it was powered on. It's the project in my sig. You can see how far I got with it. Consequently, it was my need to fix (and, of course, simultaneously upgrade) that setup that put me out on going further with it. The card still works.
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post #36 of 36
Wasn't this already done previously?
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