Slashdot Mirror


House Paint Foils Wardrivers

Ant writes "Security-minded U.S. decorators' supply outfit, Force Field Wireless, claims to have developed a do-it-yourself solution to the international menace of marauding geek wardrivers: DefendAir paint 'laced with copper and aluminum fibers that form an electromagnetic shield, blocking most radio waves and protecting wireless networks.' According to the South Florida Sun-Sentinel's report, one coat of the water-based paint 'shields Wi-Fi, WiMax and Bluetooth networks operating at frequencies from 100 megahertz to 2.4 gigahertz", while two or three applications are 'good for networks operating at up to five gigahertz.' However, there are downsides to this." Since it's a water-based paint, exterior use is only recommended for people who want more copper and aluminum in the soil surrounding their house.

31 of 444 comments (clear)

  1. What about cell phones by drgonzo59 · · Score: 4, Insightful

    Would you have to climb up the chimney to call your friends?

    1. Re:What about cell phones by drgonzo59 · · Score: 5, Informative

      Yap, at just about 1.9 GHz (or at .9 or 1.8 GHz for my European friends).

    2. Re:What about cell phones by pyrote · · Score: 4, Informative

      Does your phone operate at frequencies from 100 megahertz to 2.4 gigahertz" ?
      Yes, 1.9Ghz actually

      --
      THE WORLD IS GOING TO END!!!! eventually.
    3. Re:What about cell phones by Anonymous Coward · · Score: 3, Funny
      Would you have to climb up the chimney to call your friends?
      Climb up the chimney? You could just walk outside. You don't have pointy-hair perchance?
    4. Re:What about cell phones by rsidd · · Score: 4, Insightful
      I object to the on-call people being in movie theatres. Go see the frickin' movie on the night when you're NOT on-call.

      I like the way some people assume doctors are not allowed to have a life. It's ok to call the doctor whenever you like, day or night, but it's not ok for the doctor to go out and watch a movie? The doctors I know leave their phone on vibrate, sit at the back of the theatre, go out to answer a call (more often it's an SMS which they can answer sitting where they are). Exactly what's wrong with that?

    5. Re:What about cell phones by maxwell+demon · · Score: 3, Funny

      I've heared rumors of a revolutionary invention which could relieve you from climbing up the chimney. It's called fixed line phone.

      --
      The Tao of math: The numbers you can count are not the real numbers.
    6. Re:What about cell phones by Anonymous Coward · · Score: 5, Funny

      900 megahertz overclocked to 1.2 gigahertz.

      fucker rings FAST!!!

    7. Re:What about cell phones by stuartkahler · · Score: 3, Insightful

      I object to the on-call people being in movie theatres. Go see the frickin' movie on the night when you're NOT on-call.
      Some doctors are pretty much on call 24/365. If you're the only [FOO]ologist practicing within 200 miles, you take calls whenever someone has a question. I'm not talking about small towns in the middle of nowhere either. There are lots of subspecialties that only have one practicing doctor serving a population base of millions.
      Not that they're the problem. It's the teenagers who thing they're some kind of socialite and can't wait an hour to find out who dumped or hooked up with who. Or even worse, the idiots who think that having a cell phone makes them part of the elite, and they spend every waking moment showing it off.
      Theaters who really care would post notice that they kick out people with ringing cell phones. No refund. Then follow through.

    8. Re:What about cell phones by csteinle · · Score: 3, Informative

      GSM phones regularly try to poll their base station even when not in use. When there's no signal, they do this at maximum power.

    9. Re:What about cell phones by Hognoxious · · Score: 3, Funny

      Just replace your foil hat with a foil hut.

      --
      Confucius say, "Find worm in apple - bad. Find half a worm - worse."
    10. Re:What about cell phones by kaustik · · Score: 3, Insightful

      Some of use are on call 24-7. For example, I carry a Blackberry where I get messages related to things like dropped pings on a critical production server. The Blackberry is always on vibrate, and I doubt that the slight buzz would even be heard by anyone in the theater. At that point, I can decide whether or not I need to leave, or at least begin to plan what I will do when the movie ends. If I do decide to leave, I am no more of a bother than the tons of people getting up to piss every 15 minutes.
      I would purposely avoid movie theaters that blocked my signal.

  2. Dupe by BenFranske · · Score: 4, Informative

    This story was already covered here

  3. Neal, you're dumb by Anonymous Coward · · Score: 5, Informative

    Just because it's water base doesn't mean it will wash away with water. Latex paint is water based... Once the water evaporates the emulsion hardens.

  4. wow... by Anonymous Coward · · Score: 5, Funny

    they make tin foil hats for houses now...

  5. Whatever... by A+Boy+and+His+Blob · · Score: 5, Funny

    Paint your house with this stuff? Psshh, I take care of the SOURCE of the problem, I shoot war drivers with my paintball gun.

  6. Reminds me of a store my father once told me by aardwolf204 · · Score: 5, Interesting

    My dad was a war photographer in Korea. He had some level of clearance and once was working at a base on the coast of Florida photographing experimental weapons. He was walking around the facility and started talking to a major. The major was complaining about the fishing boats close off the coast, saying that they were known communist spies doing surveillance of the bases secret operations. The nature of the operations made them need to be outside and there was not much they could do about keeping the spies from photographing their operations from the fishing boats.

    My dad suggested that they build a pipeline around the base and pump extremely hot water through it. The steam would keep the spies from getting clear photographs of the bases operations.

    Ever been to the airport and notice that distortion coming off the top of the jets in the summer? The waviness is caused by the steam and heat coming from the plane. This is the basis for the pipeline.

    The major had the pipeline constructed and shortly after the fishing boats stopped snooping around the base. Think of it as a photographic firewall...

    Its not that OT when you think about it.

    --
    Im dreaming ofa big bndwdth, That can resist the /.crowd.May ur days b merry & bright & may al
  7. How useful! by Myrkridian42 · · Score: 3, Insightful

    This is great, unless you YOURSELF want to connect from the outside, like from your backyard.

  8. Dupe by complete+loony · · Score: 3, Funny

    (sung to the tune of the popular song "Gold Gold Gold Gold")
    Dupe Dupe Dupe Dupe
    Dupe Dupe Dupe Dupe
    Dupe Dupe Dupe Dupe
    Dupe Dupe Dupe Dupe

    --
    09F91102 no, 455FE104 nope, F190A1E8 uh-uh, 7A5F8A09 that's not it, C87294CE no. Ah! 452F6E403CDF10714E41DFAA257D313F.
  9. Er... lightning? by digitect · · Score: 3, Funny

    This seems also to be an ideal product to increase the chances of your house being struck by lightning, too.

    --
    There is no need to use a SlashDot sig for SEO...
  10. What about windows, ducts, etc.? by Krankheit · · Score: 4, Insightful

    How will you cover areas such as windows? If this doesn't cover the windows, war drivers are not foiled.

    --
    Powered by caffeine and sugar; BSD
    1. Re:What about windows, ducts, etc.? by plover · · Score: 4, Funny
      Simple. Run Linux, then you don't have to worry about your Windows...

      /me ducks, then covers! :-)

      --
      John
  11. Re:Interesting... by plover · · Score: 5, Informative
    Umm, no. Faraday cages are bi-directional. They block EMF in either direction.

    For proof, go stand in front of your microwave oven with the door closed, heat a glass of water for a minute, then go reproduce. If your children are born with n arms, where 1 < n < 3, the EMF was blocked.

    --
    John
  12. Confounded...!@#$% by dassbaba · · Score: 3, Funny

    En..cryp..tion..? What is this newfangled devilry?!

    --
    !@
  13. Useful and fun! by ZiZ · · Score: 4, Funny

    I love this stuff! I use it all the time to paint my tin-foil hats to look more like hair. You know, like in Calvin and Hobbes.

    --
    This flies in the face of science.
  14. Re: Old-Fashioned Siding by Lucas+Membrane · · Score: 3, Informative

    Take a look inside your walls. I'll bet you've got thermal insulation in there that is in those rolls sandwiched between aluminum foil. That will put a pretty good dent in the UHF and up, but the RF will leak out elsewhere.

  15. Radiation in a reflective cavity. by goombah99 · · Score: 3, Interesting
    This could also create problems too. past studies have noted that cell phone intenisty inside subway carriages can be 100 fold higher due to resonant trapping of the energy. Edge effects could be even higher. Like wise there will be reflections creating nodes in your house. Since the wavelengths are quite long these nodes will be macroscopically large.

    Notably, the corners of your house will act like corner cubes maximally reflecting the energy back to the emitter itself. If the emitter happens to be your laptop then you are going to get the majority of the radiation passing through you on each round trip bounce.

    as it happens, the wavelength is near the wavelength of your microwave. The microwave is tuned to optimally excite the rotational frequency of aqueaous water. The 2.4 Ghz is slightly off the optimum but You are inhogenous enough that you probably absorb quite well in this region. The rest of the dry materials in the room wont be doing much absorbing. Thus you will become the primary fate of all the radiated energy.

    so you lose on two accounts: 1) high field strengths 2) all the energy resonates around till if finds your testicles.

    --
    Some drink at the fountain of knowledge. Others just gargle.
    1. Re:Radiation in a reflective cavity. by Green+Salad · · Score: 3, Funny

      Not everyone has testicles...you inconsiderate clod!

    2. Re:Radiation in a reflective cavity. by PatrickThomson · · Score: 3, Informative
      The microwave is tuned to optimally excite the rotational frequency of aqueaous water.

      Er, no it's not. Microwave ovens radiate at about 2.3-2.4 GHz, but the resonant frequency of water which that affects is about 10 GHz. The suboptimal matching means that microwaves penetrate food, rather than flash-boiling the outside layer and leaving the inside raw.

      --
      I am one of many. My idea is not unique, nor do I expect my voice alone to sway you. I speak in a chorus of opinion.
  16. I was on that fishing boat! by SlimFastForYou · · Score: 4, Funny

    Your father's scalding water scared all the fish away, you insensitive clod!

  17. Brains! Brains! Brains! by dbIII · · Score: 3, Interesting
    Or are we all disoriented and stricken with alzheimers due to the aluminum
    Here's an interesting bit of trivia about the early alzheimers research: it compared fresh brains from a control group with brains of sufferers that had been preserved in an aluminium sulphate solution. For years people were trying to work out how we could possibly metabolise aluminum (it take serious chemicals, heat and electricity to extract it from alumina) until someone took a look at the orginal study and tracked down the contaminant.

    The more stupid the mistake the less people want to admit it - it took many years before aluminium was ruled out as a contaminant, but since the aluminium link had been in the newspapers for years we are stuck with another urban myth (just like the wartime carrot nightsight myth - you can't magically boost you night vision with carrots (Mawson didn't get better vision fron a near lethal dose of vitamin A), but it was the excuse to avoid admitting that radar existed in WWII).

  18. Yet another Windows Security Hole by Tavor · · Score: 5, Funny

    This time a bit more litterally. No one wants to paint over their transparent light-holes!

    --
    Windows has detected an undetectable error.