Can You Hear Me Now?
Julian Sanchez | August 10, 2005, 2:23pm
This piece from The Guardian last week discusses growing popular support for the use of surveillance technologies, as well as a little feature of your friendly cell phone I hadn't been aware of:
Not only can operators pinpoint users to within yards of their location by "triangulating" the signals from three base stations, but - according to a report in the Financial Times - the operators (under instructions from the authorities) can remotely install software onto a handset to activate the microphone even when the user is not making a call.
JB | August 11, 2005, 1:35pm | #
Ok, first we are talking about software to capture voice data here, not GPS. Everyone should be aware of the GPS capabilities built into their wireless phone which has been strongly supported by the public for 911 services.
As Eric II stated most major carriers do offer services that make us of the GPS locator for subscribers. So if you subscribe, and it does cost so you can be sure that the carrier won't allow access unless the owner agrees to pay for it, you could use the cell phone you bought your child to track their location.
The main point of the article is that people need to be aware that as phone's become more intelligent they more closely emulate PC's than dumb rotary dial phones. And just as Homeland Security has convinced congress to allow them to come in an install software on your PC to track your keystrokes there is the same capability to do so on cell phones. However, just like with a PC, if the power is off the software cannot run.
As for installing the software on the cell phone most carriers are able to "push" software to your cell phone. Again just like with a PC, in fact I just had a similar event happen while typing this. I had requested an upgrade of my Microsoft Project from the company and they just called to let me know they had installed it. While I have been working on my PC, at a somewhat noticeably slower rate, they were installing the upgrade in the background.
By the same token the government can "push" software to your PC that will enable any microphone or other device (for instance Bluetooth or Wifi connection to local equipment) to activate and pass data back to them. That is if you don't have a firewall installed. Everyone knows how big a problem adware and spyware is, don't think the government doesn't make use of the same capabilities when given a chance. However, unlike MakeaMillion.com, the government can go into your house while you are gone and install software bypassing the firewall.
Still, bottom line is that your paranoid Lebanese friend is still wrong thinking that a phone can monitor a conversation when off, if he is defining off as powered down.
P.S. Eric II, as EVDO rolls out increasing the available bandwidth for internet connections watch for carriers to start monitoring for use of the phone for PC access. The phone does report if the data traffic is originating from the phone or from an off-line device. Most carriers, including Sprint, do charge for use of the phone for PC internet access, but today are unable to detect when it occurs. Some, like Sprint, monitor for unusually high data traffic and will come after you if you don't pay for PC networking. This service is more than the $10 a month Vision plan, though I don't know how much.
FG_Powers | August 11, 2005, 2:45pm | #
Quoting "Occam's Beard":
"Second, the article refers to "'triangulating' the signals from three base stations." While "triangulating" would imply "three stations" to the technologically impaired (e.g., journalists), in fact only two are necessary, for those who stayed awake during high school trig. More stations would be nice, but why mention three explicitly? Why not four, or more?
"Explicitly specifying three strongly suggests that no one connected with this story has a clue, and just presumed that triangulation would involve three."
Unquote.
And for those of us who went beyond high-school trig, and studied electronics, and physics, we know that triangulation from two stations requires that the receivers be able to receive DIRECTIONALLY... thus establishing the two base angles, and the distance between them (known) for the good ol' ASA proof.
Sadly for reality, cell towers do NOT receive directionally in any useable way. Tryingto triangulate a source from two stations with directional information, gets you TWO possible loci, 180 degrees from each other perpendicular to the baseline of the two receivers.
The triangulation done using cell receivers is based strictly on SIGNAL STRENGTH... which (as those of us who stayed awake through the vector-force part of college trig know) requires 3 separate pieces of intensity (aka relative distance) data to establish a point in space using three fixed stations, when you have no angular data.
(I think you're holding that detector backwards, dude.)
And if the cell has a GPS receiver in it, well, you don't have to triangulate at all. Obviously.