Re: [TSCM-L] {1564} Re: [TSCM-L] Who has what? - compromising emanations
James M. Atkinson wrote:
> The DSI radios are great units, and you can do all kinds of cool
> stuff with them because of the extremely wide bandwidth, and
> capabilities built into the receivers to do raster analysis.
>
> I like the DSI R-1550 which will give you coverage from 20 Hz to 40
> GHz all in the same system, with a capability to detect and measure
> signals down to -215 dBm, or 40 dB deep into the noise floor (I kid
> you not), but only to -164 dBm without performing a hat trick with
> the noise floor..
>
> The wideband capabilities of the DSI R-1550 give you some very
> interesting capabilities because you have ID bandwidth of 200 MHz,
> and above (on a center frequency of 1450 MHz), so you can tweak the
> radio to give you a bandwidth of over 450 MHz.
>
> They also have a sweet little Raster Analyzer box that does with the
> radio and a nice spread spectrum detection interface as well.
>
> ---
>
> If you use a multi channel AD converter for a SDR you can run the
> samplers at a slight time offset from each other to create a spectrum
> that is six times wider then using just a single channel. The coolest
> implementation I have seen of this yet used 24 Analog Devices, 2
> channel AD convertors to provide 48 actual channels which when
> combined give you an instantaneous bandwidth of 3.6 GHz in a single
> box. The only wrinkle is that you end up getting so much information
> that you get the "drinking from a fire hose" problem biting you as
> you can fill a 2 TB hard drive array real quick.
>
> -jma
>
>
>
>
> At 08:40 PM 5/11/2007, coderman wrote:
>
>> On 5/10/07, Nick Named <xxr..._at_twcny.rr.com> wrote:
>>> Which law enforcement agencies have signals intelligence capability?
>>> The kind of capability TEMPEST was designed to protect against.
>> that's a great question. i hope someone on the list knows the answer...
>>
>>
>>> Is there capability like that in private hands? Could someone do
>>> something like that with a laptop, a directional antenna and
>>> something like gnuradio - http://www.gnu.org/software/gnuradio?
>> Markus Kuhn at Cambridge [0] has built emanations monitoring gear for
>> reading laptop displays at considerable distance [1] using an R-1250
>> [2] (and other hardware, iiirc). this would also be possible with the
>> right RF front ends attached to the nallatech hardware i referenced in
>> another thread. (the GNU radio USRP might be suitable, but the
>> bandwidth limits of that device would be close, or under what was
>> needed for good visual capture)
>>
>> gnu radio does indeed provide some of the base signal processing
>> components that could be used for this purpose, but the hardware, not
>> processing, will likely be the crux.
>>
>> best regards,
>>
>> 0. Markus Kuhn
>> http://www.cl.cam.ac.uk/~mgk25/
>>
>> 1. Compromising emanations: eavesdropping risks of computer displays
>> http://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-577.html
>>
>> 2. Dynamic Sciences R-1250 receiver
>> http://www.cl.cam.ac.uk/~mgk25/r1250/
>>
>>
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