What level of tech do you think the US REALLY has?

Doesn't matter Tony. You're RIGHT. If our Sci-Fi films can do it, so can technology today.

 

it reads the van eck waves off the chips, not the crt crap, an lcd monitor would offer no protection, research Van Eck phreaking, hell google it, along with tempest, you can use supposedly impervious fonts but that is from back in the day when it was "shut down" (btw, Have blue {the f117a} was "Shut down" when it went classified, and there is evidence that this is being used large scale, ths ssn jimmy carter {nuclear submarine} has the capability to "listen in on trans-oceanic cables without damaging them, how might it do that we ask? it would have to read the em radiation emanating from the cables)

Go ahead and look this up, research this crap, you will find that you are a lot less secure than you think you are.

 

Well we have had the tech. for cars to get up to 70 a gallon since the 70s. So who knows how much they are keeping from us!!!

Love my country, fear my government!

 

The van eck effect relies on picking up the EM fields from your monitor or indeed your printer. A CRT is effectively a small particle accelerator and generates fairly large electric fields for a piece of home equipment. Your LCD monitor however uses switches by charge from a small capcitor. For a typical TN panel the typical switching voltage is around 5V, this fields involved are miniscule compared to those from a CRT. So as you point out the only way to pull this trick on an LCD would be to use emissions from the cabling, however a device required to do this would have to be hugely more sophisticated, I guess reading an LCD from the road outside someones house would be like trying to read a CRT from some distance off, maybe over a mile. THough I suspect this wont have stopped the US government trying, of course its also far easier to jam emissions from an LCD monitor, with the use of a similar circuit, and array of LEDs would probably be suitable.

 

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definately an advert for making sure that all the wire in cables actually terminate. Though what effect would a metal case have? Would a metal computer case not be a reasonable approxiomation to a faraday cage, output cables not included.

 

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Now I have to balance my paranoia against the beauty of my perspex window. Though if your that paraniod just set a function generator up next to your computer, give them somethign else to decode.

 

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Fair point, I have some ITO somewhere. I knew optics would come in at some point. Though I never thought id go round doing my windows through paranoia.

 

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yes an lcd creates less noise but their reading the van eck waves from the chips, a van eck wave is the "bounce" when the chip goes from 0 to 5 mv to state a zero or one it's the chips or the transmission not the actual production of the image, otherwise I could gice it a permanant by tweaking the advanced settings in my nvidia menu, seriously, wherever you get your info from is off, monitor type doesn't matter, that system wouldn't be as adaptable

 

No it works by picking up the field generated by an accelerating charge, a van eck wave as you call them are not different to any other EM wave. In the case of an LCD monitor this can only be oscillations in the circuitry. The panel itself doesn't carry a moving charge, there can be ions in the LC but significant effort is put into removing these ions as the can cause unwanted orientation of the LC and ruin the image. In the case of the CRT monitor the signal has to be hugely amplified to accelerate the electrons, hence the field is much stronger. So in the case of the CRT the detactable field will be far stronger from the amplifier than any of the microelectronic circuitry. At least I hope so.

Incidentally, I now have my house incased in electrode coated glass. Im not sure that a sub-mircon layer is think enough to attenuate anything but it looks cool.

 

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Getting the signal from a CRT beam or amp current is easy enough. Ive been trying to get my head around how you'd take the signal out of a TFT addressed panel. You have a number of superimposed frequencies and imnot sure how you disentagle it all. Im thinking that passive matrix would be more or less impossible to decode.

 

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True, thats why im not sure how you'd get a TFT. There is some addressing row by row I believe which I guess you may be able to use as a starting point. Although I suspect a lot of manufacturers use their own techniques, looking at the number of subtly different technologies out there.

 

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yeah im tempted to have a go now, didnt realise how easy it was.