Reaver is a tool that can be used to perform a brute force attack on Wi-Fi Protected Setup (WPS) enabled routers to reveal the WPA/WPA2 password.

To install Reaver on Kali Linux, follow these steps:

1. Open the terminal and update the repository list:

sudo apt-get update

2. Install Reaver using the following command:

sudo apt-get install reaver

To use Reaver, follow these steps:

1. Make sure that your wireless card is in monitor mode by typing the following command:

airmon-ng start wlan0

2. Find the target network by typing the following command:

airodump-ng wlan0mon

3. Take note of the BSSID and channel of the target network.
4. Start the Reaver attack by typing the following command:

reaver -i wlan0mon -b <BSSID> -c <channel> -vv

5. Wait for the attack to complete, which could take several hours.
6. Once the attack is complete, the WPA/WPA2 password will be displayed.

Note: Using Reaver to crack Wi-Fi passwords without the owner’s consent is illegal and unethical. The information provided is for educational purposes only.