how do you defend against the above?
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how do you defend against the above?
http://www.military-information-tech...cfm?DocID=1185Quote:
To shield electronics from EMP or EMI, the equipment needs to be encased in a metal housing, often in the form of what is known as a Faraday cage. The openings to that housing would be sealed with electrically conductive gaskets. The housings can range from tiny, such as the metal soldered on printed circuit boards, to housings that are the size of rooms that protect critical electronic equipment inside.
The cables and/or wires entering the housing need to be shielded as well, because without such shielding, a cable or wire acts as an antenna that carries an EMP or other EMI directly into the device. The shielding of such cables typically consists of a wire mesh. conduit—the metal case through which wires and cables can be placed—may work as well, for facility-level shielding.
I would suggest, however, for a cheap solution, adapting the following to your proportional needs.
http://zapatopi.net/afdb/build.html
http://www.geocities.com/CapeCanaveral/5971/emp.html
for homework write google rulez 1000 times and try to remember it next time ;)
I wouldn't really worry about the emp. The nuclar blasts that created it would get all my attention. :eek:
There are many things that can cause EMP other than nuke blasts, some intentional, and some not. Also, the methods to protect from EMP also go hand in hand with protecting from TEMPEST. Most definitely a worthwhile investment when dealing with sensitive data.
Errrrr....................Darlene~
Sorry to seem "picky" but what is your question about?
1. Data security re EMP/EMF.................as in TEMPEST, nonstop etc.?
2. Physical equipment security............as in continued functionality?
I have to deal with several instances of EMP damage a year..............a close lightning strike is enough............ :zap:
Well...just to contribute a little to what has already been said...
this is the latest report to Congress that I could find on HEMP and HPM...
http://72.14.207.104/search?q=cache:...ient=firefox-a
High Altitude Electromagnetic Pulse (HEMP) and High Power Microwave (HPM) Devices:Threat Assessments
and as nihil suggested...lightning and Electromagnetic Pulse...
http://www-star.stanford.edu/~vlf/pu...is/node13.html
2.2 Heating of the lower ionosphere by the lightning electromagnetic pulse: elves
The question may have been prompted by a recent US TV episode of Threshold, where a small EMP generator was used to take out all the computer-chip-based devices in a 100-mile radius of the center of Miami or something--and save the world!. Yes, you can generate an EMP and disable solid-state circuit and microchip-based technology within range of the device. To get 100-mile radius would require an immense amount of power and I doubt very much that the EMP generator capable of that kind of power would fit in a pickup (reference Electronic Devices for the Evil Genius).
Hi rapier57,
Like the movie ' Small Soldiers ' where they blow the transformer by overloading the system causing an EMP shorting out the chips. :D
Eg ;)
Well, suspension of disbelief was already extended to the animation of Small Soldiers in that movie. In Threshold, suspension of disbelief should be limited to the alien invasion. Adding impossible technology and generally bad science just blows the whole thing.
Isn't that Asimov's Principle? Solid SF allows for suspension of disbelief in just one thing?
Anything else is just fantasy.
Here's the best part, EMP GENERATOR KITS ARE AVAILABLE ONLINE!!!
http://www.plans-kits.com/plans/emp.html
If you wanna go homebrew, check this out:
http://www.airpower.maxwell.af.mil/a...pp/apjemp.html
The above also has some information on hardening against, and deploying emp weapons if you manage to pick up an old Mig21 on Ebay.
I always enjoyed the net stories you read about saying that hackers would make emp weapons out of radioshack parts and then they would black mail banks for millions.
One thing you want to think about before you spend all your money on hardening your PC from EMP blasts is how your going to interract with it. Any kind of wire going in or out of your faraday cage is a road for the pulse. What this means for the small timer is no power, keyboard, mouse, monitor, network connections or anything for that matter. That is unless you put a fuse on each connector so that massive pusle pops the fuse in a heartbeat. I could be wrong, but seems rather pointless, as your probably in deeper **** than a broken computer if its EMPs doing.
Ah but killerbees, don't forget about the wonders of wireless keyboards and mice. Although the faraday cage would probably screw up most of those as well. Unless you had an infra-red set...
That's why, qwertyman66, TEMPEST defense is more of an exercise in futility.
Yeah, killerbees, you got it.
I'm gonna greenie darlene. This was a cool thread. Even though it borders on fantasy.
transformers make pretty colors when they explode...
anyway, unless you have some money burning a hole in your pocket that you have absolutely NOTHING else to spend on, i wouldnt spree for a faraday cage. they are more used for protecting vital governmental or corportate data from freak lightning strikes and the ocassional alien spacecraft or mad scientist. and if its nuclear blasts you shouldnt be worrying about losing the 60GB of downloaded music and pron on your computer.
I think a faraday cage would screw up the wireless connections, and if you could manage to get a signal thru them, that antennae would be another line straight into the computer. The only way you could really get an effective faraday cage is if you put your whole building in it, it had its own generator, and you had a laser acting as your network cable inbetween you and whatever your internet medium is. However, the price tag of all that makes it only feasable for people in Forbes Magazine and your average government.
Hell, I don't even think your average world government has stuff that cool. On a side note though, I've seen some electronic homebrew types who've created some EMP style guns that will kill a computer monitor. I can't remember the particular site but I know they are out there.
Now TEMPEST is another story all together. We've almost gotten to the point where if someone with enough money wants to figure out what your doing, they will. Its gotten to the point of shooting Microwaves through walls to measure the vibrations of clothing to figure out what people are talking about in the room. Oh, and then there's that guy who came up with the "Angel Light" device that can see through walls and such. I don't really buy that though, his whole claim to fame is building a suit that he could fight a bear hand to hand with. Although the french gave him a bunch of money. So i don't know what to believe with that. I just can't get over who the hell would want to build a suit to fight a bear hand to hand. Thats what we invented guns for. Oh, and the guy designs these pads that can survive RPG attacks and stuff. I saw it on the discovery channel. Really cool stuff.
I love the discovery channel because now I know exactly who to talk to if I have to fight some bears armed with RPGs.
OK
Please give me a little while, but I will post some fonts that will not resolve under a TEMPEST attack...................honest, I kid you not :D
Just don't ask where they came from, huh?
No good against modern stuff though (Spesh~ did you understand that?) ............................
Gotta put a few dots in for Spazza? :D
Ack Phtt!
One of my Evil Genius books has a project for building a small laser/receiver package that can be used for eavesdropping. Shoot the laser at a window, and the receiver picks up the vibrations in the glass (registered by the laser) and translates that back into sound. Stealth listening.
Hemmingway was right, they are using lasers to see into our brains!
Hey I got two little somethings to think about.
- Alot of people believe cd's would survive an EMP (because their plastic or something). Are cd's/dvd's immune to EMP's? They don't contain chips, but they do have conductive layers. Also when you put a cd in the microwave, it will give you a nice spark show. However, an EMP doesn't nescesarily contain microwaves.
- In how much a way does an EMP have a magnetic impact and what is the impact of a big magnetic pulse? Afaik a faraday cage only protects against the electric part of an EMP, not the magnetic part.
cds are optic media light is more likely to harm them than emp, and pvc is an insulator ;)
Well, granted that the CD/DVD would be protected from the effects of an EMP from a nuclear burst (since that is an electromagnetic pulse). But, an artificially generated pulse is effected through the generation of microwaves. So, there is a chance that the artificially generated EMP could cook the data on the CD/DVD, depending on proximity.
However, in a nuclear burst, the heat and flash would probably vaporize the CD/DVD pretty effectively, too.
Awwww! c'mon guys...............
What about neutron bombs?
We all know they are there? :D :eek:
Neutron bombs cook your Thanksgiving turkeys pretty well. Although, you'd be too busy being dead to eat it. Neutron bombs are actually pretty sweet. I read an article by one of the original designers. It was built as an ethical bomb. There aren't any wounded, just dead. Although, it kind of lacks the pizazz of vaporizing a few city blocks and then incinerating a mile out, followed by collapsing structures with shockwaves for another couple miles, and then collapsing buildings with pressure differences more miles out from that.
The whole magnetic side of things with EMP, thats new to me. You learn something everyday. I guess you better have a Linux LiveCD in the CDROM drive of that faraday cage just in case.
As far as the laser beam project, check out the Laser FAQ, do a google search it'll be in the top 10, there's a bunch of cool stuff you can do with lasers. You can build a 14400 baud modem out of a laser pointer, some radioshack stuff and serial cables. I haven't tried it yet but it seemed like it would be pretty sweet. The Audio over a laser pointer project seemed pretty cool too. I was going to buy a lot of 10 laser pointers on ebay for about $10 and try some of that stuff.
Yeah doh, but on the subject of EMP, a cd is not made of pvc only. There's other materials in there too wich aren't insulators. Microchips have a ceramic (or whatever) casing, but they still get fried inside.Quote:
Originally posted here by dopamin
cds are optic media light is more likely to harm them than emp, and pvc is an insulator ;)
Sheesh, a lot of you need to go back and take another (or perhaps a first) physics class.
A faraday cage is a concept... not some prepackaged thing. Hell my old apartment was a pretty good faraday cage (cordless phones only worked on a line of sigh basis etc)... cost me nothing beyond rent. Out here in California with the earthquake requirements a lot of buildings act in this way thanks to all the rebar.Quote:
anyway, unless you have some money burning a hole in your pocket that you have absolutely NOTHING else to spend on, i wouldnt spree for a faraday cage. they are more used for protecting vital governmental or corportate data from freak lightning strikes and the ocassional alien spacecraft or mad scientist. and if its nuclear blasts you shouldnt be worrying about losing the 60GB of downloaded music and pron on your computer
Your car is a type of faraday cage as well... if you are inside and lightning strikes it, you'll be fine. So is your microwave, what did you think that wire mesh in the door was?
You've lost me here... you're sitting in your cage with the EMP device just outside? Wouldn't it be better to use a modem? God knows the kinds of cancers you'd be begging for otherwise.Quote:
Ah but killerbees, don't forget about the wonders of wireless keyboards and mice. Although the faraday cage would probably screw up most of those as well. Unless you had an infra-red set...
This is very questionable and even still, better to eavesdrop on the CPU rather than the monitor.Quote:
Please give me a little while, but I will post some fonts that will not resolve under a TEMPEST attack...................honest, I kid you not
Microwaves are not hot, they (if operating at 2.45GHz) merely excite water molecules. I don't know about you, but I tend to keep my optical media fairly dry.Quote:
So, there is a chance that the artificially generated EMP could cook the data on the CD/DVD, depending on proximity.
Anyhow... have you ever purchased a cable that has a dB rating on it? That is the level of shielding and it directly corresponds to the protection from EM interference that cable will have. Cheap cables use a magnet tied to each end. This way you just raise the signal and the noise floor and ideally strip out all the noise and weaken the signal enough to be usable at each end. the same would apply for your cables around an EMP device... shield them (a magnet strong enough to strip the EMP would kill the signal under normal use) Shield your computer in a similar manner. Normal shielding would be just an all metal case and issues of material and design become more complicated as your requirements go up.
To further protect your device, you'd want a shielded UPS and against shield the connections and you'd want a fuse on the wall line. In addition to shielding your system and input devices, you should also shield your monitor... though by shield I mean "read up if this is for fun or buy a TEMPEST protected system if your requirements demand it".
If you follow these principals on your home AV system you will notice clearer sound and picture as well. :)
cheers,
catch
But, what about the spilled soda and stuff from the cupholder? Mine keeps kicking in and out and spills my soda and it also gets all over my Meatloaf CDs.Quote:
Microwaves are not hot, they (if operating at 2.45GHz) merely excite water molecules. I don't know about you, but I tend to keep my optical media fairly dry.
;)
catch,
Water doesn't have anything to do with it. Microwaves are electromagnetic waves and they can cause discharges in all kinds of things. For proof just google for cd+microwave or something. Example: http://hamjudo.com/notes/cdrom.htmlQuote:
Microwaves are not hot, they (if operating at 2.45GHz) merely excite water molecules. I don't know about you, but I tend to keep my optical media fairly dry.
Didn't you ever put an iron cup in the microwave ?
edit:
because striek (3 posts down) kinda misunderstood me... water does have something to do with the workings of a microwave over. I'm sctricly talking about the effect on a cd though. The effect on a cd is not caused by water molecules.
Radio waves in this frequency range have an interesting property: they are absorbed by water, fats and sugars. When they are absorbed they are converted directly into atomic motion -- heat. Microwaves in this frequency range have another interesting property: they are not absorbed by most plastics, glass or ceramics. Metal reflects microwaves, which is why metal pans do not work well in a microwave oven. In microwave cooking, the radio waves penetrate the food and excite water and fat molecules pretty much evenly throughout the food. You can put metals in the microwave. No sharp corners.
http://home.howstuffworks.com/microwave2.htm
Edit#####
He said cook the data out....hmmmmmmmm..............I don't know if the data would be destroyed. The thin layer would be in fragments, but I don't know if you could extract data from the fragments.
neel, you DUDE! You found THE solution to all those AOL cds!
DISCLAIMER:
Kids, don't try this at home. Leave these kinds of things strictly to us perfessionals.
;)
When reheating food, it does. The microwaves physically excite the water molecules. Water molecules have a different charge on each side of them, since they are triangular in shape with the hydrogen atoms on one side an the oxygen atom on the other. The microwaves act on this polarized molecule by physically flipping them around based on the apexes and dips in the waves' power cycles. The EM field generated by the microwaves attracts one side of the molecule more than the other.Quote:
Water doesn't have anything to do with it.
In terms of heating, microwave radiation can only act on such polarized molecules. This is why the food heats up so much more than the plate it's sitting on, but every once in a while you seem to have a plate that always heats up really well in the microwave.
But as for electrical discharge due to the release of static charges, I have no idea...
The circumstances for that CD to pop are very specific... I can assure you that metal isn't exploding around Elmendorf AFB or other such installations (though you prolly could cook meak on the ground 100yds out).
cheers,
catch
The cd thing isn't that specific, it works on a real big spectrum of em-waves as long as there's enough energy in the waves.
Here's some more microwave fun I stumbled on: http://margo.student.utwente.nl/el/microwave/
Yes, those are long range 3-D radars operating between 1200 and 1400MHz, the microwave oven is a very specific application running at 2.4MHz. The oven is meant to cook stuff the radars are not, in fact there are standards for what is acceptable from an air safety viewpoint.Quote:
I can assure you that metal isn't exploding around Elmendorf AFB or other such installations (though you prolly could cook meak on the ground 100yds out).
:)
All that is happening is a little ohmic heating when it vaporizes the metal. When it vaporizes, electricity can flow through the vapor causing a few arcs. http://en.wikipedia.org/wiki/Vapor
Sorry I haven't replied to this thread but my library's computer blocks posts and there is no Internet Cafe, Kinko's. If your computer is down and other access is unavailable, you're thwarted. I'm working on rectifying the situation.
Nihil, you're not picky. I liked your question. It's a good question. I can't answer the question with any specificity.
Michigan legislature Bill 4513 is an amendment to 1931 PA328, which defines crimes and prescribes penalties for crimes. The above crime is defined as: "a device designed to emit irradiate or that, as a result of its design, emits or radiates an electronic pulse, current, beam, signal, or microwave that is intended to cause harm to others or cause damage to, destroy, or disrupt any electronic or telecommunications system or device, including, but not limited to, a computer, computer network, or computer system".
Massachusetts has a similar law.
The traditional wisdom was that if something sends out a electronic pulse, current, beam, signal, or microwave, you could trace it. With a directional antenna, a receiver that picks up the signal and displays its strength, you should be able to find out where the signal is coming from and where the sending antenna is.
Now I'm thinking that if a device is radiating an electronic pulse, current, beam, signal, or microwave it would be difficult to determine where it was coming from. Technically speaking to measure a signal and to use the right testing equipment, you have to know rather precisely what type of signal you are looking for.
Dang, my particle beam ray gun is illegal in Massachusetts, and soon Michigan! Where will it stop? Suppose they will outlaw plasma generators, too?
;)