Look up "AirSnort" as long as you can sniff the traffic, even if it is encrypted, you can crack it.
Most encryption schemes give you the illusion of privacy. As long as you can record the network traffic, there will be a way found to crack it.
Look it up? I use that and Airfart when doing penetration tests. Hell, wireless security is a frickin' joke. The only thing it does is provide wired equivalency at best.
You misunderstand me. I am referring to encryption of the content...even if it moves via an encrypted tunnel such as over a VPN and/or SSL/TLS.
Cracking PGP (or GPG) is another story altogether. That's what I'm talking about.