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You wish to do offline cracking by using a passive sniffer. What program would be best to use?
airsnort -pl localhost.localhost > password_list.txt
vnstat
metasploit
ettercap
wireshark
Wireshark is best used as a passive packet sniffer. These packets can then be analyzed by offline tools. Does the work "cracking" not imply password cracking, with something like John The Ripper? So Wireshark doesn't fit with that choice of words, try a word like "analyzing."
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