So, even if a key was ever cracked, a new a person would be generated straight away at the start out of your future session. On leading of that, Perfect Forward Secrecy results in a new encryption key just about every time you log in. I used this aspect to set up my household network as "secured" and all other people as "unsecured." That way, my system is shielded just about every time I use a public Wi-Fi community.