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ee4itproFlag for United States of America

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Wifi security

I wanted to test my wifi security, but I don't know how.  My friend just went to a "computer show" and purchased some software that is supposed to "crack" any wifi and we had a conversation over the phone and he wants to prove that this software will crack my wifi.  My question really is how can I make sure he does not crack my password/passphrase?  According to him, the software can crack WEP, WPA, and my WPA2 encryption.  

Lastly, how would I be able to test my own network.  What I wanted to do was since I have three pc's/laptop's within my wifi, how could I connect to another pc/laptop or view other files within my separate pc's/laptops without knowing their ip address?
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rindi
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WPA shouldn't be crackable if you use a long, strong passphrase with a mixture of caps, non-caps, numbers and make sure that phrase isn't anything that is included in any dictionary. But WEP can be cracked within a short time provided enough packets can be captured by the hackers.
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hypercube
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The best way is to only allow specific computer to connect to your WIFI by adding them Manually using MAC Address other others is Blocked.

Next is to make sure that WPA,WPA2 or AES is your Wifi Encryption.

Do not broadcast your SSID.