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A.2 Getting the Android Link Key for Classic Decryption
Bluetooth devices on an encrypted link share a common “link key” used to exchange encrypted data. For a
Bluetooth sniffer, such as the ComProbe BPA 600, to be able to decrypt the encrypted data, it must also have
this shared link key. For obvious security reasons, the link key is never sent over the air, so either the user
must get the key out of one of the devices being sniffed and supply the key to the sniffer or the sniffer must
create the key itself.
Bluetooth devices using the Android operating system have a "developer" option that will provide the link key
for Classic Bluetooth decryption. This procedure will use the developer options to obtain the Android HCI
(Host Controller Interface) log that contains the link keys for all active links..
A.2.1 What You Need to Get the Android Link Key
The process applies to the Android 4.4 or later operating system.
l
Android device with Bluetooth enabled and paired with another Bluetooth device.
l
ComProbe Protocol Analysis System installed on your computer
l
Android Debug Bridge (optional)
Note: Each Android device model can vary in screen organization, layout and format. The
directions in this paper are based on known typical Android device. Refer to the
manufacturer's manual,on-line help, or technical support for detailed information about
your particular device.
A.2.2 Activating Developer options
The Android HCI log will contain the link key for an active Bluetooth link.
1. On the Android device go to
Settings
,
2. Select About .
3. In the About screen tap on Build number eight times. At some point you will see a notice similar to
Frontline BPA 600 Hardware & Software User Manual 297