[unisog] Guidance needed (cellular detection)

Paul FM paulfm at me.umn.edu
Tue Dec 8 20:18:51 GMT 2009

This is still a form of JAMMING (sending out a signal that interferes with 
another device) and is still illegal in the US.

Peter C. Lai wrote:
> 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
> message...
>> 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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Paul Markfort   Info: http://www.menet.umn.edu/~paulfm

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