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[liberationtech] New Satphone Safety Guide
collin at averysmallbird.com
Wed Mar 21 21:24:22 PDT 2012
Jumped the gun and found the answer regarding 'discreet operation SIM' on
slide 17 here:
On Thu, Mar 22, 2012 at 12:19 AM, Collin Anderson <collin at averysmallbird.com
> Would anyone in this conversation be so kind as to satisfy a tangential
> curiosity of mine. The case of Alan Gross in Cuba seems so wrapped up in an
> under-explained and over-hyped piece of equipment:
> On his final trip, he brought in a "discreet" SIM card -- or subscriber
>> identity module card -- intended to keep satellite phone transmissions from
>> being pinpointed within 250 miles (400 kilometers), if they were detected
>> at all.
> Beyond the obvious issues with that statement; does anyone know what they
> are referring to?
> On Tue, Mar 20, 2012 at 11:22 PM, Jacob Appelbaum <jacob at appelbaum.net>wrote:
>> On 03/16/2012 02:48 PM, Brian Conley wrote:
>> > Thanks Jacob, comments in-line.
>> Hey Brian and other libtechers,
>> This should be extremely interesting to everyone:
>> Note the little bit on location info in that pastebin:
>> .... ...1 = GCI: MES is GPS capable (1)
>> .... ..1. = R: 1
>> .... .0.. = O: 0
>> GPS Position
>> 1... .... = CPI: GPS position is current position (1)
>> .001 1000 0000 0111 0011 .... = Latitude: 33.78961 N (98419)
>> .... 0010 1111 1100 1011 1111 = Longitude: 67.21414 E (195775)
>> .... .000 = Number Type: Unknown (0)
>> I believe that means the caller was here when the intercept caught them:
>> Here's the background information:
>> David Burgess, praise be upon him, says:
>> "The Channel Request message is the first message sent from the handset
>> to the satellite at the start of any transaction. This message cannot be
>> encrypted. This message typically contains the following information:
>> the IMSI of the satellite phone handset
>> the called number (in the case of mobile-originated calls) and
>> the GPS location of the handset."
>> The best part of his blog post for those who can't load the page is this
>> "Well, the uplink from the handset is only visible for a kilometer or
>> so, but the feeder link is visible over roughly 1/3 of the planet's
>> surface to anyone with a C-Band dish and is not given any additional
>> So - yeah, ouch!
>> All the best,
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> *Collin David Anderson*
> averysmallbird.com | @cda | Washington, D.C.
*Collin David Anderson*
averysmallbird.com | @cda | Washington, D.C.
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