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You should have a really good password for your wireless. There is a unix program called airodump-ng that runs on Linux that can catch hashes through the air. Password lists can be used to dictionary attack.
You should also use a combo of lower case, uppercase and special characters. And don't make it something like Hello1!. And don't make it just numbers.
The same hash grabbed with airodump can be used in OCLHashcat (that uses masks). They look for common patterns.
?l?l?l?l?l?d?s Brute forces all possible combos with 5 lower case followed by one digit followed by one special character.
If your password is a 10 digit number, Even though it is 10 digit a mask can be used to guess the numbers really fast in OCLHashcat.
?d?d?d?d?d?d?d?d?d?d - same as a phone number - It didn't take long to try all these combos on a crappy graphics card.
If they ever make a version of airodump-ng to go one windows with a nice GUI interface, Things will change.
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