handshake-via-pcap

HANDSHAKE-VIA-PCAP Open the pcap or cap in wireshark and type the following capture filter

eapol || wlan.fc.type_subtype == 0x04 || wlan.fc.type_subtype == 0x08

This will give you authentication beacons etc

+++++++++++++++++++++++++++=

Crack a valid handshake inside of a pcap file

aircrack-ng -w