Get the Whitepaper called Packet Sniffer to Sniff Sensitive Credentials Only.
You can download it from the following link: https://packetstormsecurity.com/files/download/156319/packet-sniffer.pdf
Source: https://packetstormsecurity.com/files/156319/Packet-Sniffer-To-Sniff-Sensitive-Credentials-Only.html