Learn how to install CrackLE on kali Linux and start cracking Bluetooth PINs. If you want to read more about on this article: Bluetooth Penetration Testing Fundamentals: Part 1

crackle exploits a flaw in the BLE pairing process that allows an attacker to guess or very quickly brute force the TK (Temporary Key). With the TK and other data collected from the pairing process, the STK (Short Term Key) and later the LTK (Long Term Key) can be collected.
Author
CrackLE Limitations
How to easy install CrackLE
Step 1: Install dependencies
sudo apt-get install libpcap-dev
Step 2: Clone the GitHub repo
git clone https://github.com/mikeryan/crackle.git
make
sudo make install
Step 3: Use CrackLE
crackle -i input.pcap -o decrypted.pcap
crackle -i <file.pcap>
crackle -i <file.pcap> -o <output.pcap>
crackle -i <file.pcap> -o <out.pcap> -l <ltk>