In our university users have to use VPN to connect to internet.But for local works(like login to university website,checking their university accounts) VPN is not needed.And as I know we have unencrypted wireless LAN connection which is not secure at all. As a computer student, to show these problems I want to get some passwords of users accounts or get some files of on users computers.(without using any hacking software) As I never have such experience before, I searched a lot but I didn't find a good way.I prefer to use CMD. What are the best ways to hack such LANS?
closed as not a real question by Adnan - Adi, Eric G, bethlakshmi, AviD♦ May 15 '13 at 20:37
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If it is truly unsecured wireless, then a simple packet sniffer should pick information on the wireless network out of the air though you may have to use special drivers if your wireless card normally only presents information that is being sent to your MAC address. Most passwords would still be secure though as they should be getting exchanged using secure means such as HTTPS or other handshake protocols.
What you'll get is a raw dump of network traffic though and if you don't know enough to know how to sniff wireless traffic already, you are likely not going to be able to pull much useful out of a raw network traffic dump. There will be a lot of information there to sift through.
Also, as I mentioned in the comments, what you are trying to do would likely be considered abuse. I strongly advise not trying it or if you insist on trying it, use two computers and only monitor your own connection on the other computer. That way you are at least able to make an argument that you were not compromising anyone else, but it's still a really bad idea.