If you're at the point where you have something to brute-force with a dictionary then it's irrelevant how you arrived there. It's simple FACT given sufficient time/interest/resources the key will fall.
Implement industry best practice for choosing and maintaining your key(s)/passphrase(s) and stop wasting time trying to prove something that's known FACT.
Now the math. Assume you're only using a 15 character key that's:
If you can store that much data you can afford to find better ways to protect your network or get access to "other" Internet connections.