![]() Its purpose is to avoid the subscriber from being identified and tracked by eavesdroppers on the air interface as I am trying to do :). This is a random assigned identity assigned to the SIM when it connects to a BTS. Before we get into the decryption process, we need some information specific to our SIM card.įirst we need the Temporary Mobile Subscriber Identity ( TMSI). We now have the traffic captured and saved in a file called capture.cfile. I then send an SMS reading “This is a demo of GSM decryption” to the Orange line. f is the frequency in Hz, -s the sample rate in Hz, -g the gain, -c the output file and -T the duration of our capture in seconds. I begin the capture using the following command:Īirprobe_rtlsdr_capture.py -f 949200000 -s 1000000 -g 40 -c capture.cfile -T 60 I’ll use the airprobe_rtlsdr_capture module of gr-gsm to capture the SMS traffic. In this case the frequency the Orange BTS was operating on is 949.2MHz. 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. Follow the previous post on how to do this. Next we sniff the GSM frequencies our mobile operators use and identify the specific frequency the BTS is operating on. In my case I use the awesome Android IMSI Catcher Detector. The phone I am using is an android phone and there are several android apps that will give you this information. There are various ways to get this information such as the engineering menu on blackberries. 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. A BTS is uniquely identified using an assigned cell identity (Cell ID). I therefore need to identify the BTS that my Orange line is connected to. The technical term for this is the downlink. The specific point at which I’ll capture the traffic is as it’s being sent by the BTS to the Orange line. I own both lines steering clear of the legality issue of decrypting other people’s traffic. I am going to send an SMS from a Safaricom line to an Orange line, capture the traffic over the Um (air) interface and decrypt the data to retrieve the SMS. I start with SMS traffic which falls under the data category. With this in mind I’ll do a two part series to demonstrate how voice and data can be sniffed using the HackRF. The traffic that the normal user of a telecommunication network is concerned with is voice and data. GSM traffic carries a lot of information, from system information to the actual voice and data we are familiar with. You need to first deactivate this app from the Device Administrator.In the previous post, I explained how GSM traffic can be sniffed with the HackRF One. * Activate the device admin and that's it. save photo of the intruder on google drive Send alert email with photo of the intruderĥ. A detailed photo logs of the mobile snoopers.Ĥ. With that, you can easily find if someone used your mobile without your knowledge.ģ. Last unlock time feature will show you the previous lock screen unlock time. The app automatically takes a photo while someone enters the wrong PIN, Pattern or Password.Ģ. Snap Photos of Person Who is Entering Wrong Unlock Password or PIN on your AndroidĮr tries to unlock your phone without your knowledge.ġ. this is a simple app with no frills that will photograph the person when they try to unlock your phone. Your friends or family member might have tried to unlock your phone. Use This app and catch all the mobile snoopers with ease. This app will capture a photo of the intruder each time he/she tries to unlock your device. How To Capture Someone’s Picture Who Tries To Unlock Your Phone They take a picture with the front-facing camera when someone enters the wrong PIN. Takes a photos using the front camera when someone tries to unlock your phoneĪ camera for thief who tried to unlock the phone.Ĭatch the thief who try open your phone lock.Įver suspected someone of trying to unlock your phone while you’re away, but haven’t been able to prove anything? One of these apps might come in handy.
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