How to install CrackLE
Posted in: Bluetooth Hacking

How to easy install CrackLE: Crack Bluetooth PINs

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

Install CrackLE : Crack Bluetooth PINs
Install CrackLE : Crack Bluetooth PINs

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.


Often when it comes to wireless technology, encryption is used to keep information secure, and Bluetooth is no exception. The Personal Identification Number (PIN) that is used in Bluetooth is a code that two devices must enter in order to establish a secure connection. Unfortunately, due to the complexity of the encryption process, it is possible for a determined hacker to crack a Bluetooth PIN and gain access to whatever data is transferred through the connection.

For an average user, it’s important to keep the Bluetooth PIN at least 16 digits long, as it makes it much more difficult to crack. The traditional PIN is not case-sensitive but if possible, it’s a good idea to add some variation with both upper and lowercase letters. It’s also recommended to avoid using dictionary words or simple series of numbers, such as 1234 or 0000.

However, even with a complex PIN code, a skilled hacker is still able to break it. The common method for cracking a Bluetooth PIN is called a “brute force attack.” This attack essentially involves the hacker running through a list of potential PIN numbers until they hit the correct one. The hacker may even be able to use software designed to guess numerical combinations.

To protect against this kind of attack, an approach called “address randomization” is used. Bluetooth addresses are periodically changed in order to make it harder for hackers to predict the address and PIN combination.

It’s important to note that a hack into a Bluetooth PIN doesn’t always require the hacker to be in the same physical space as the devices to be connected. Even if two devices aren’t in close proximity, a hacker can still use a “dictionary attack” which involves randomly entering different PINs from a list of potential combinations.

While it is impossible to guarantee that a Bluetooth PIN won’t be cracked, users can take the necessary steps to make it much more difficult for a hacker to do so. Using strong and varied PINs, and taking advantage of the address randomization technology is the best way to increase the security of Bluetooth connections.

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
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>

CrackLE GitHub

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