Gsm сниффер

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Gsm сниффер

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Gsm сниффер

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GSM traffic carries a lot of information, from system information to the actual voice and data we are familiar with. The traffic that the normal user of a telecommunication network is concerned with is voice and data. I start with SMS traffic which falls under the data category. The technical term for this is the downlink. I therefore need to identify the BTS that my Orange line is connected to. The cell identity combined with the location area identity LAI which uniquely identifies the country, mobile network and location area code is what we need to get. There are various ways to get this information such as the engineering menu on blackberries. The phone I am using is an android phone and there are several android apps that will give you this information. Next we sniff the GSM frequencies our mobile operators use and identify the specific frequency the BTS is operating on. Follow the previous post on how to do this. We will accomplish this by searching the traffic being captured on wireshark for the LAI and Cell ID our phone is on until we have a match. In this case the frequency the Orange BTS was operating on is I begin the capture using the following command:. We now have the traffic captured and saved in a file called capture. Before we get into the decryption process, we need some information specific to our SIM card. Its purpose is to avoid the subscriber from being identified and tracked by eavesdroppers on the air interface as I am trying to do :. We will then need to get the Kc , which is the key used to encrypt the traffic between the phone and the BTS over the air. I will get into the details of how the Kc is calculated in a later post but for now you can read up on the A8 algorithm. These guides here and here are great references. I used AT commands on a connected Samsung S3 mini as follows:. In idle mode the phone has to listen on the BCCH to detect traffic to be sent to it. We first start wireshark and monitor the loopback interface and then run the following command:. We then search for traffic specific to our TMSI by searching for it in wireshark packet details. We now need to identify the ciphering mode the BTS tells the phone to use. We confirm the most recently used Kc as shown earlier, then we restart wireshark on the loopback interface and run the following command:. The question becomes how do you get the Kc in use by another mobile device? They also automated a lot of the steps in this post making decryption of gsm voice and data almost trivial. Till then, happy hacking.

Gsm сниффер

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Gsm сниффер

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