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RF-Blocking Wallpaper

Posted by timothy on from the use-extra-glue dept.

spitefulcrow writes "Silicon.com is reporting on a new application for RF-absorbing materials: Wallpaper that blocks Wi-Fi. BAE, the British defense contractor, has announced that the same material used to foil radar by stealth bombers can be used to selectively block certain frequencies and prevent wireless networking signals from entering or exiting a building. Is this the next take on lining the walls with lead?"

26 of 344 comments (clear)

  1. Great for paranoid nuts, useless for real people by Bender_ · · Score: 3, Interesting


    Ok, its nice. This wallpaper blocks a lot of RF radation. This means that you can not use WLAN, cellphones and terrestrial TV/Radio. Is this really what you want?

  2. I'm really busy by isoprophlex · · Score: 5, Interesting

    I will be wonderful when the adhear this technology in movie cinemas so that the wankers sitting behind me who answer there phones during the films, can't take their "important calls".

    1. Re:I'm really busy by nacturation · · Score: 4, Interesting

      What if a doctor were to go watch a movie and one of his patients started dying and he needed to be contacted? What if a loved one were in an accident and people were trying to get ahold of you so you could possibly see them before they died?

      There are many scenarios where having cell reception is important.

      Man, what *did* people do before cell phones? Give out the public number to the theatre/opera/amusement park/restaurant/stadium's land line and have an employee come and get them if they got a call?

      Actually, an interesting note is that some classy restaurants offer this as a service. They ask you to forward your cell phone to a special number, let them know your name and where you're sitting, and the restaurant staff picks up the call and comes and gets you. "Excuse me, Mr. Smith, but you have a call. This way please..."

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    2. Re:I'm really busy by Anonymous Coward · · Score: 2, Interesting

      Or what if Jodi breaks up with her boyfriend Brad and Sally can't call me to tell me so I can get rid of this loser Ted before the next football game? If I can't have my cell phone on in a theatre or hospital, I will probably end up marrying Ted or just jumping from guy to guy my whole life. Brad is such a hunk of tasty meat.

      Signed, Katelyn

  3. Why Not Just Encrypt? by afriguru · · Score: 5, Interesting
    UK defence contractor BAE Systems has developed a stealth wallpaper to beat electronic eavesdropping on company Wi-Fi and wired LANs.
    Instead of qoing through the hassle of covering a building with this wallpaper, why can't system admins just get into the habit of implementing encryption all the way (particularly for Wi-Fi networks?)
    --
    ___
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    1. Re:Why Not Just Encrypt? by Myolp · · Score: 3, Interesting

      Instead of blocking signals to prevent eavesdropping, this could actually be used in rooms where you don't want a constant RF-signal passing through, like your childrens bedroom or something.

      The main reason I don't want WiFi in my home is the potential health-risk. If I could limit the RF-field to certain rooms, I just might consider it.

    2. Re:Why Not Just Encrypt? by BlueWonder · · Score: 3, Interesting

      When planning a security system (not restricted to computers, I'm talking about security in general), it's usually a good idea to take into account what an insider can do. Most often, what an insider can do is a strict superset of what an outsider can do, so if your system is secure against attacks from insiders, it's automatically also secure against attacks from outsiders.

      In the case at hand, it might be possible to use separate cryptograhic keys for separate groups of insiders, just like not every employee in a large company has a door key for every single door in the building. Restricting the signal by means of a wallpaper could be harder.

  4. Nice and all, but who's going to use it? by lokedhs · · Score: 2, Interesting

    I mean, if you have such sensitive data that you need to install this, why not simply use copper cables, and spare yourself the hassle (and sleepless nights in case the cat tears the wallpaper).

  5. Ok, it stops it going through the walls by Anonymous Coward · · Score: 1, Interesting

    But what if someone opens a window?

  6. Interesting by hot_Karls_bad_cavern · · Score: 5, Interesting

    For sometime i've wanted to have my main workstation off the network, grid and inside a faraday cage. But think about how ridiculous that would be/look? The other machines in the house would be okay to leave alone, but i'd want at least one that i knew was safe (data transfers would be on extreme need only, i.e. data sets into and encrypted messeges written inside).

    But i'm getting away from my original point: this is sweetness. No, it's not exactly what i'm looking for, but it's a stop in the correct direction. Think you've never had a neighbor whom owns a 900MHz scanner? Anyway, i think this is great. You and i both know that information, its protection, secure dissemenation, and reliability of said information are the weapons of the upcoming century. You need to have your data safe whether you think so or not, so the more things like this the better.

  7. Re:Okay, nice idea but... by Hungus · · Score: 2, Interesting

    Glass can be coated with a "transparent" (ok not really transparent but it looks like window tinting) conductive material that will block various ranges of em radiation. We have used it in the past with gauss cages to build em isolation rooms for conferences

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  8. Shielding is Hard by Detritus · · Score: 4, Interesting

    Assuming that you cover the walls with this stuff, you still have to worry about the floor, ceiling, windows, doors, ventilation ducts, plumbing and electrical wiring, plus any holes or gaps in the shielding. Then there is telephone, LAN and video wiring to worry about.

    --
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  9. Yes, hospitals too. by teidou · · Score: 5, Interesting

    Most people don't understand why hospitals would use this: every hospital I have worked in would be interested.

    Cell phones, even by being on can affect drug infusion pumps: it is not good to have the infusion rate spontaneously jump from 1 mL/min to 100mL/min. What's worse is that some people don't know the difference between "standby" and "off" - they think just not using it will turn off the transceiver. (Yeah, yeah, Snopes says it's not a big problem. They're FOS on this one: it really does happen).

    Some visitors argue it is a problem with the medical equipment and they should get to keep their phone on: 1) possibly a valid point, but the fact is that patient health is threatened by the phone, and 2) the historic FCC position is that RF shall not interfere with other equipment. (Incidenally, new medical equipment is better shielded (hinted at on the FDA website).

    Finally, to the genius who wants to point out that many hospitals are using wireless for notebook computing and wireless monitoring: 1) those in use are on different frequencies than cell phones, and 2) they are very carefully tested before implementation, (Also, I'm not sure on this point, but I believe they are probably less powerful than cell phones; this is why repeaters are in every hallway rather than just one on the roof. If the wallpaper is just on the exterior of the building, I doubt it would not interfere with current use).

    Teidou

    1. Re:Yes, hospitals too. by Myself · · Score: 5, Interesting

      While you're right that it's the transmitter's responsibility not to cause interference, I still think it's dangerously irresponsible to keep old machines in service that've proven themselves unreliable in the face of common interference.

      You make an excellent point that the WLANs used in hospitals are very low power. Yes, they put APs every few yards down the hallways, so that the portable devices never have to step up their transmit power to reach one.

      The solution to the cell phone problem in hospitals is to put base station equipment IN the hospital and run Radiax down the hallways. Alternately, just put cell sites as close to the building as possible. When the phones can reach a tower easily, they'll limit their output power accordingly.

      This is also the counterintuitive solution to the weenies who protest when a cellphone company wants to put a tower near the high school. (This frequently happens when an athletic field is getting new lights.) Compare a cordless phone to a moonbounce transmission, which requires more power?

      The first mobile phones weren't cellular, there was a single base station in the center of town. The powers used were on the order of 50 watts, so it's a good thing the vehicle-mounted antenna was several feet from the handset. When cellular was developed, it meant you were always within a mile or two of a tower, so the power levels decreased drastically. Phones reduce their output power in response to requests from the tower, because it's easier for the tower to "hear" the faint phones if the near phones aren't screaming.

      Shielding the place into an RF hole is counterproductive. In the event that someone forgets to turn their phone off, it'll sit there chirping out its maximum transmit power every once in a while, searching for a tower it can't find. Worse yet, it'll maintain contact with a tower it can just barely hear, only if it really blasts out the RF. This helps nobody.

  10. This will thrill my boss. by rayd75 · · Score: 3, Interesting

    She constantly embarrasses me by explaining to visitors that our wireless network is secure because "we only use the lower power equipment that is hard to pick up outside the building". Never mind the DMZ, L2TP tunnel, MAC filtering, client firewalls, etc. Oh well, at least she is letting me keep the access points turned on more often these days.

  11. This scream "health issue" by shpoffo · · Score: 4, Interesting

    Does this sound to anyone else as causing similar problems as reported by a study from the UK (reported here on /.) about cel phone usage in trains raising the ambient radiation levels about those deemed safe by regulatory committees? When the waves are 'blocked' I get the sense that they're reflected back into the space. Probalby makes for a stronger signal, but you'll also get radiation build-up, and perhaps focusing effects - where you'll get small spaces where there will be a literal 'hot spot.' Everyone could go and set their food on the left corner of the third filing cabinet from the end of Dave's cubicle for a few minutes to heat it up before lunch......

    yuck

    .
    -shpoffo

    1. Re:This scream "health issue" by man_ls · · Score: 2, Interesting

      My phone I have broadcasts at its maximum of 750mW for 30 seconds, after which it chirps 750mW for 1 sec every 30 trying to find a cell site.

      Verizon CDMA

      Not too worried.

  12. What I'd Like... by Gyorg_Lavode · · Score: 2, Interesting

    You know what I'd like. A clear, (well colorless as in it wouldn't make my walls look funky), coating I can paint on in my apartment to try and block out whoever the bastard w/ the 2ghz phone is. It farks up my wireless at least every other night.

    --
    I do security
  13. My parents were doing this when I was a kid by macemoneta · · Score: 5, Interesting

    My mom always loved the foil/felt (flock) wallpapers in our dining room, when I was growing up (about 40 years ago). The foil was always grounded, because it went under the (metal) outlet and switch covers, which in turn grounded to the (metal) box. I know the foil was conductive, because we once had a two-wire appliance short to it's metal case (before the days of 'double insulated' design), and I got a shock touching the wall and appliance.

    Maybe companies selling this kind of wallpaper should rebrand it as inexpensive high-tech (but low cost) Faraday shielding. And maybe the defense agency could save a few billion dollars by using an off-the-shelf solution. Nah.

    --

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  14. I know a man who had this in the Eighties... by qtp · · Score: 4, Interesting

    The computer room (floor, walls, and ceiling) was lined with akluminized wallpaper, the window had an aluminum screen. His own home-built faraday cage.

    As he did not have wi-fi, I beleive that he was more concerned with preventing eavesdropping of his CRTs rf feild. There were other CS guys (from the uni) who did the same thing.

    As he my first real programming teacher, I always assumed that the tech to "tempest" a CRT was available then. Tapping WiFi is undoubtably a magnitude simpler.

    --
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  15. I wonder by BCW2 · · Score: 2, Interesting

    if the foil coated sheathing panels put under the siding of some houses does the same thing? Or someone might make a fabric version to be used like Tyvek as a house wrap during construction. Then everything stays in the house.

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  16. That's the RIAA's rationale. by originalhack · · Score: 3, Interesting
    So flog the person who talks on the cell phone in the theater with the nearest appropriate object. It's time to stop blocking signals because some people might abuse them. It's also time to realize that we shouldn't keep people from using computers and recording equipment because some people might violate copyrights.

    There is no reason to block those of us who put the phone in silent.

    I glance at the callerid if the phone vibrates. When an apparrently urgent call comes in either in a theater or in a restaurant, you hit answer and walk out the door. Anybody calling me in the off hours is accustomed to calling a second time if I ignore the first (calling again a moment after the first attempt is a good signal of urgency) and waiting for me to get out the door between the time I hit answer and the time I speak. Most also make sure they call my cell FROM their cell so that callerid works and I can just call them back.

  17. RF Proof clothes? by freeduke · · Score: 3, Interesting

    That could be cool to build RF proof clothes with a tissue that has the same properties as this wallpaper. So that you could hear your cell phone, without fearing for your health! ok, problem arise when you put it in one of your pockets and wait for a call...

  18. Reuse by Doc+Ruby · · Score: 2, Interesting

    Sure, the RF power it absorbs is tiny. But is there a way to capture that power for reuse? Like a solar collector, powered by our RF devices?

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  19. Re:I know it's not tin foil, but.... by wiresquire · · Score: 2, Interesting
    That's close. According to Chemical Division of Los Alamos National Labs, the history of alumin(i)um is:

    (L. alumen: alum) The ancient Greeks and Romans used alum as an astringent and as a mordant in dyeing. In 1761 de Morveau proposed the name alumine for the base in alum, and Lavoisier, in 1787, thought this to be the oxide of a still undiscovered metal.

    Wohler is generally credited with having isolated the metal in 1827, although an impure form was prepared by Oersted two years earlier. In 1807, Davy proposed the name aluminum for the metal, undiscovered at that time, and later agreed to change it to aluminum. Shortly thereafter, the name aluminium was adopted to conform with the "ium" ending of most elements, and this spelling is now in use elsewhere in the world.

    Aluminium was also the accepted spelling in the U.S. until 1925, at which time the American Chemical Society officially decided to use the name aluminum thereafter in their publications.

    So it changed in the 1920's. I guess all that Charlston'ing went to people's heads.

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  20. RFID by bigbigbison · · Score: 2, Interesting

    So I could take this to a store, wrap an rfid tagged item in it and steal it? So you are saying that a new technology can easilly be circumvented by criminals and therefore only serves to annoy and monitor law abiding citizens? That's umpossible!

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