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TMSIs, IMSIs, and BTS Oh My! – The Rabbit-Hole
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Build ProgressTMSIs, IMSIs, and BTS Oh My!

July 18, 2011by WhiteQueen

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It’s been a while since we had anything major to update you with, so here’s something to wet your whistle.

Captured IMSIWhat you are seeing is the Temporary Mobile Subscriber Identity, or TMSI, and the International Mobile Subscriber Identity, or IMSI, for RedQueen’s GSM cell phone attached to the GSM base station on-board the UAV. I’ve blacked out the IMSI information, as it’s essentially the Social Security Number for cell phones. The number 310410 represents USA (310) and the AT&T network(410).

Here are some excerpts from Wikipedia that hopefully help explain:

The TMSI is the identity that is most commonly sent between the mobile and the network. TMSI is randomly assigned by the Visitor Location Register(VLR) to every mobile in the area, the moment it is switched on. The number is local to a location area, and so it has to be updated each time the mobile moves to a new geographical area.

The IMSI is a unique identification associated with all GSM and UMTS network mobile phone users. It is stored as a 64 bit field in the SIM inside the phone and is sent by the phone to the network. It is also used for acquiring other details of the mobile in the Home Location Register (HLR) or as locally copied in the Visitor Location Register(VLR). To prevent eavesdroppers identifying and tracking the subscriber on the radio interface, the IMSI is sent as rarely as possible and a randomly-generated TMSI is sent instead.

 


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previous
Wireless Aerial Surveillance Platform-DEFCON19

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Vegas or Bust!!!

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