Triangulate from wifi

I tried talking. I reported in school on Menwith Hill when I was in 9th grade, 15 years ago, and the teacher wanted to hear none of it. Not even my closest family listens. SJWs are hating on the queers, and if Hillary wins the US presidential election then I have reasonable cause to fear that the NSA will target an persecute gays, much like what went on in the s, but this time they have a huge database full of information that can be turned into crimes as quick as any media empire can sway public opinion.

Gays and most other groups seem to have it made. Though yes there seems to be an overreach of power. Troll suspected. Waste of my time. I sometimes see RFID shielding holders in shops in passing, but am not sure how well they sell. Those used an encryption that was broken as soon as someone seriously tried….

The field has to be strong enough at the target to excite the resonant circuit, and the target must cause a sufficient change in the field that the source senses it.

Which is the entire point of NFC. He could bury a coil under the sidewalk though, theoretically. Maybe even process and convert it to a WiFi signal for remote reading without wires. Hide it inside of a top hat. Nobody would suspect, and he would look snazzy! A fluctuating magnetic field transfers half its power to the electric component at a certain rate. You can use an E field and an H field antenna to recover both components. The earths magnetic field radiates rather far.

NFC readers are the same tech as a metal detector, and they can pick up objects several feet away with a small coil. Maximum range should be proportional to coil diameter, so reading NFC cards from the street should be doable. Yes and no. The NFC relies on the field source to induce enough energy into the target for the target to power itself, and then the target starts to modulate the field by tuning its resonant circuit in and out of sync.

You have to provide a certain field density up to the target, and for several feet away that means immensely strong fields. With a very large field like wrapping your house with wire, you get all sorts of interference from pots and pans and cars driving by etc. You might find your wifi stops working, or other unfortunate, hard to remedy things. Go set up a target in the garage and practice. You just made yourself a target. Your first point is not, or at least not anymore, valid.

That stuff is now a common-man kind of thing. But she can read, so she has a custom SSID and a better password than me. And she remembers what her IP address is! Many people are starting to understand some minimum information about routers and I. All of the routers in my neighborhood are using some sort of encryption and have assigned their own passwords — so they are at least cognizant of how to use their wireless access points and some administration.

But I would thing as others have said — knocking on their doors and asking for them to change the I. I could be wrong here but I believe that your everyday normal wifi signal is considered public broadcasting. As in, the same as somene sitting on the porch and yelling. A person could point a camera at you and press record while standing across the street; perfectly legal.

You, me, or the idiot with the offensive SSID can change it in minutes. I know that some of the commenters here can do it in seconds. Upper left. If you are the same strength on 1 and The equations are pretty straight forward. Mathematically, the challenge is going to be finding the numbers to plug into the equations. As for the coding part Edit: Here is a more in-depth explanation of how you would accomplish your task.

Don't forget, what you're posting above assumes it's done in free space. Signal is going to vary quite a bit once you put this in a building. Thanks for the replays guys, after reading them I have to the conclusion that a weaker router might be better for accuracy or better yet a using Bluetooth. As you say in a building there will be obstructions, the idea is to mount them ft in the air and have lots of them so i can always calculate the signal using 3 or more routers.

The fact that I will end up using a fingerprinting technique using rssi will also help, i mean it will involve more work i. The finger prints would be taken at 5ft distances apart. Its a pitty GPS III wasn't out already apparently its going to impove indoor navigation, to what extent thought i dont know, and also if it need a special type of reviver.

Now you're getting into too expensive to setup and lots of noise area. You don't want to flood the area with too much 2. Bluetooth, just like wifi, runs on 2. So yes, your proposed setup will make things noisy. On top of that Expensive has hell! Your best bet, before you go too crazy, it to just try it with a couple of routers. Also, calculating your distance to the router gets tricky: The building, what it's made of and how much of that is between you and any one router , the time of day, the model of access point, all play into how strong the signal is, and how much noise there is.

So, with all of those factors, it will be imperfect. And that's OK. Start small, learn, and then grow. Yea that sounds like the best idea, in the words of steve baulldmer, experiment, experiment, experiment lol.

You can post now and register later. If you have an account, sign in now to post with your account. Paste as plain text instead. Yeah, no that's wrong. I'm not trying to be an ass here always the way you want to start a post - but if you are THAT concerned about people finding ways to access your wireless network, keep it on copper and don't use wireless at all. There will ALWAYS be a way to steal something if someone wants it bad enough - it's just a matter of the amount of time and resources they are willing to put into it.

Are you comfortable confronting this individual? What would be your next step in dealing with this situation? Basically I'm saying that this won't be the last time - so you'll either have to continue being paranoid or stick to a purely wired network where the chance of network access is minimal at best.

You mentioned not being interested in the device's IP address, but perhaps you should be. You can at least do some DNS work to get a device name, depending on how it connected.

Which you haven't told us. You can get such info from a number of free network scanning utilities, including fing for Android, etc. Those things, even if they work, don't get you a physical location - a taller order than you may think - but you might be surprised at how revealing they can be.

I'm feeling like we don't know your real goals and motivations here. Was going to post pretty much this. Why do you need to physically locate this person, instead of following the tips already given for securing your network?

You seem willing to spend money on one of the devices Frennzy linked to. Have you contacted the local police? What exactly do you plan on doing in the extremely unlikely event you are able to track this device and owner down?

How to find a device on you wireless network: Block it from accessing the internet by feeding it bogus DHCP, or with a firewall access list or whatever nefarious means you prefer. Wait for the target to complain that the internet is down. There you go. LOL we do that in IT shops. Disable the misbehaving port and wait and see who squeals. That'll teach 'em.

It was a popup that showed a rotating 3D picture of the surrounding wifi clients and APs. I would think social engineering would be the cheapest and equally accurate solution.

If you're in an apartment complex, I don't see how you'll succeed. If you're in a typical subdivision, there are only so many options within range. The 3D picture thing is just for show. I just looked. DD-WRT will tell you some signal strength.

It'll update every few seconds. Using a directional antenna and a bunch blocking one side with a few sheets of aluminum foil. You'll be able to narrow down at least a general direction of the person. I would hate to help someone physically locate a wifi-thief and find out they chopped them up for their Wifi-stew. Do you know anyone that works for the NSA with lose morals? Don't know how legal this would be in the country you're in Locating anyone, even via a foxhunt, is going to be somewhat of a PITA.

It's possible, but they have to be actively using your AP and you're going to have to move the AP around quite a bit. Which means you need two APs in order to keep the Internet working.

Also, if you're in any place where you can't just figure it out by looking around like an apartment building , the ambiguity is going to be too high.

Your odds of reliably narrowing it to one room are pretty low. Only a very dedicated person would waste their time on such an endeavour. And that dedicated person is either going to be far more knowledgeable than you no offense, but given what is shown here , or incapable of breaking in. Call it a day. It's literally impossible to determine direction via a single, unmoving dipole antenna. You can "sort of" determine location if you rely on signal strength and you move your detector around.

Otherwise, you need a directional antenna of some sort. Yeah, the best you can usually do is use a yagi or similar, wander around with your battery powered or otherwise mobilized gear, and try to find where the signal is strongest. Both on foot with a battery powered spectrum analyzer, and in vehicles with inverters running multiple spectrum analyzers and the like.

You find signal sources in the strangest places, though. As illustrated in the above image, the GPS receiver identifies its distance to each of the satellites to deduce its location through the mathematical technique trilateration — a complex version of triangulation. Generally, a GPS receiver tracks 8 or more satellites and connects with 3 or 4 satellites to determine their location. As the vehicle moves, the distance between the GPS receiver and the satellite varies, enabling the receiver to compute its location instantly.

A cell phone signal may be picked up by three or more cell towers enabling the triangulation to work. So when a triangulation happens — with the point of overlap of three signals, it is possible to estimate the location of the cell phone based on its distance from the three towers.