[unisog] Guidance needed (cellular detection)

Peter C. Lai peter at simons-rock.edu
Tue Dec 8 18:41:44 GMT 2009

For 802.11 you don't need active RF jamming. The way that vendor
infrastructure do it is by detecting ESSIDs that are trying to associate,
then rapidly send disassociate packets back (or use a PHY layer mechanism
to suppress the client by taking advantage of CSMA/CA and effectively
instill a global synchronization).

You could probably do something similar with cell phones, by detecting
their network association then inducing the ESN to constantly
disassociate; however cell tech is a lot different than wifi since it has
to interface with phone systems, so I am curious how this advertised
device could query the carrier for the ESN's number then send it a text

> On Mon, Dec 07, 2009 at 03:30:29PM -0500, J. Oquendo wrote:
>> Hey all, looking at what outside of policies is anyone doing concerning
>> cellular in the classroom. Any and all information appreciated
>> on/offlist.
>> I prefer not to get into the politics or morals of it, but has anyone
>> been tasked with deploying anything similar:
>> http://www.cellbusters.com/product_info.php?cPath=21&products_id=28
>> Please do not confuse this with jamming.
>> Any and all information is appreciated.
>> --
> 	This topic used to come up occasionally (although in regards to
> shutting down wireless access in exam rooms). We used to point out that
> wireless (and only our wireless at that, as we couldn't legally block
> ad hoc access points without jamming which is illegal in Canada), blue
> tooth,
> and cell (which it looks like this device may fix) are only the alternate
> vectors we could think off off the top of our heads. As it would have been
> a
> signifigant amount of work to modify the wireless network to do this, we
> (at least up until I retired) had resisted doing so. We expect there are a
> lot
> more vectors that students could think of and this is trying to solve a
> policy
> problem with technology which rarely works. Think also about PDAs, watches
> with memo pads (for storing cheat sheets) and who knows what else.
> 	That said this device would be a relatively painless way of doing some
> of the job (although I'd be sure to point out it isn't fool proof), and
> thus
> may be a good bet. Consider though that in most environments it is going
> to
> complain about phones in the hall way outside the exam room / lecture
> theatre
> as the RF happily leaks through most walls.
> Peter Van Epp
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Peter C. Lai
ITS Systems Administrator
Bard College at Simon's Rock
84 Alford Rd.
Great Barrington, MA 01230
(413) 528-7428
peter at simons-rock.edu

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