[HN Gopher] Van Eck Phreaking
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Van Eck Phreaking
Author : Grieving
Score : 52 points
Date : 2021-03-23 22:52 UTC (1 days ago)
(HTM) web link (en.wikipedia.org)
(TXT) w3m dump (en.wikipedia.org)
| tetsuhamu wrote:
| TEMPEST is available now, for free, on github.
|
| All you need is a $20 RTL-SDR.
|
| https://www.youtube.com/watch?v=QjqpKtGNbQo
|
| https://github.com/martinmarinov/TempestSDR
| Forbo wrote:
| Didn't know the barrier to entry had fallen so low. Last I saw
| it was only under very specific conditions with lots of
| expensive equipment that this stuff could be recovered.
| tibbon wrote:
| Why are there so few demonstration videos to be found of this?
| The one tyingq listed is one of the few concrete ones I've ever
| found. I remember reading about it in the 90's, but never being
| able to find it actually working.
| tetsuhamu wrote:
| from 2 years ago https://www.youtube.com/watch?v=BpNP9b3aIfY
| Grieving wrote:
| This video (https://www.youtube.com/watch?v=ZZ5HS8GWIec) linked
| at the bottom of the page shows the attack in action.
| [deleted]
| tyingq wrote:
| If you want to try it yourself:
|
| https://www.youtube.com/watch?v=DlVM9xqGKx8
|
| Plays Fur Elise on a radio placed close to your monitor while you
| play that video full screen.
| tgsovlerkhgsel wrote:
| I always thought it requires a CRT screen, but I got a
| surprisingly clear signal from my LCD screen.
|
| Why does this work? Where does the recoverable signal leak? I
| would expect a modern LCD to be full of digital signals sent in
| unpredictable, manufacturer-specific ways, and certainly not
| sequentially enough to leak as recognizable audio.
| tyingq wrote:
| My guess is that it's leaking in multiple places. Since it's
| relatively crude by alternating "all black" and "all white"
| pixels at different "switch rates", it generates recognizable
| noise in multiple places. That seems to match all the
| different frequencies you see people reporting to find it.
| And people finding it regardless of how the signal is getting
| to the monitor, LVDS, HDMI, VGA, etc.
|
| The "requires a CRT screen" was, I think, referencing the
| much more fine grained ability to actually recreate what was
| displayed on a screen. Though that's been replicated for LCDs
| now also.
| lippel82 wrote:
| Cheap HDMI cables typically leak image information quite
| nicely. With the right equipment, it's really easy to get a
| decent resolution image of the radiation picked up from an
| HDMI cable even over tens of meters.
| amelius wrote:
| Isn't EMC testing supposed to uncover this kind of flaw,
| and what does the FCC say about equipment which leaks like
| this?
| tyingq wrote:
| They do, but it would fall under "unintentional
| radiators", and the measurements are made at some
| distance from the device. Something like this language:
| Except for Class A digital devices, the field strength of
| radiated emissions from unintentional radiators at a
| distance of 3 meters shall not exceed the following
| values: Frequency of emission(MHz) Field
| strength (microvolts/meter) 30-88 100
| 88-216 150 216-960 200 Above 960
| 500
| gnfargbl wrote:
| Don't miss https://en.m.wikipedia.org/wiki/Tempest_(codename),
| which is at least as interesting.
| mhh__ wrote:
| https://en.wikipedia.org/wiki/Operation_RAFTER another sneaky
| one (highly recommend the book _spycatcher_ , really unique
| perspective in that the author was a proper engineer on the
| frontline in the cold war)
| q_andrew wrote:
| I remember when a character started rambling paragraphs about Van
| Eck Phreaking in Cryptonomicon, it was immediately obvious that
| this would become a plot device later in the book.
| kedean wrote:
| _POSSIBLE VAGUE SPOILER_
|
| I don't recall it actually being a plot device though. It
| effectively just served to drive Waterhouse's panic that
| someone was watching him, but then it sort of fizzles out.
| Unless I missed some implied detail, nobody actually ever used
| it to spy on him.
| kelnos wrote:
| ANOTHER POSSIBLE VAGUE SPOILER
|
| IIRC the protagonists actually do use Van Eck phreaking later
| in the novel to read out what's on their adversary's laptop
| screen from the next hotel room over.
| mszcz wrote:
| SPOILERS
|
| IIRC it's not an adversary but their fiend with whom they
| have a bet about whether Van Eck Phreaking works or not ;)
|
| Also, Van Eck Phreaking's use by their adversaries is
| implied when Randy's in jail and working on his laptop
| decrypting the coordinates of the gold stash, again IIRC.
| divbzero wrote:
| SPOILERS
|
| Yes, Randy avoids reading out the coordinates by monitor
| to keep them safe from Van Eck phreaking.
| ben_w wrote:
| Spoilers rot13:
|
| VVEP ur chgf snxr pbbeqvangrf ba uvf fperra naq trgf
| vzzrqvngryl eryrnfrq, naq gur fhfcrpgrq bccbarag tbrf gb
| gur snxr pbbeqvangrf
| jillesvangurp wrote:
| Here's the chapter in question with some helpful links. The
| bit of furniture erotica showing on the screen is hilarious
| (scroll towards the end)
|
| https://lost-
| contact.mit.edu/afs/adrake.org/usr/rkh/Books/bo...
| [deleted]
| cl0ne wrote:
| Yes, I first learned about this from Cryptonomicon. Apparently
| it wasn't performed using LCD screens until 5 years after the
| book was published.
| q_andrew wrote:
| Say what you want about Stephenson's writing, but he
| definitely has a knack for understanding concepts before they
| enter the public consciousness.
| davidw wrote:
| Is that still true? Honest question.
|
| Cryptonomicon did such a wonderful job of capturing a
| certain something from the 1990ies. I haven't enjoyed his
| more recent books as much. Seveneves was depressing. Dodge
| had really bad reviews and I haven't bothered with it.
| 2sk21 wrote:
| I just loved Anathem, Reamde and Fall.
| davidw wrote:
| I liked Anathem and Reamde. DODO was ok, although it
| leaves you hanging a bit and apparently the sequel is
| even worse from that point of view, from the reviews.
| q_andrew wrote:
| Snow Crash is parody literature, but the fantasy is built
| around very good predictions about the future. He coined
| the word "avatar" for virtual characters, and the book
| contains a direct inspiration for google maps.
| SllX wrote:
| Earth, initially. Keyhole cited Snow Crash as direct
| inspiration for their EarthViewer application, what
| became Google Earth post-acquisition.
| ben_w wrote:
| I really enjoyed Snow Crash; I felt that Seveneves was
| two completely different books that were coincidentally
| in the same universe, nether of which felt bad in
| isolation, but they definitely didn't feel unified.
|
| I wasn't a fan of Quicksilver, but as that was the first
| historical novel I've listened to, and as it was award
| winning, I assume it must be more about my tastes than
| the quality of the writing?
| davidw wrote:
| I liked the second part of Seveneves, but the first bit
| felt really depressing, and more than a bit unrealistic.
|
| I liked Quicksilver, but could easily see how it's not
| everyone's cup of tea.
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(page generated 2021-03-24 23:00 UTC)