[johnsoft]

>WPS protects the WPA key with a 7-digit PIN - cracking that PIN is enough to authenticate with the router and have it provide the encryption key.

Not only that, but routers verify the first and second halves of the PIN separately. So instead of brute forcing in a keyspace of 10000000, you only need to find one number up to 10000, and a second number up to 1000. (The second half of the PIN is actually a 4-digit number as well, but the last digit is just a checksum digit.)

If it weren't for that issue, attacks would take months/years instead of minutes/hours.

[ikeboy]

I've also read that if you have the pin, you can get the password even after WPS is turned off, which means it's a permanent pwn.

Random comment I read somewhere, so may not be reliable.