Perfect Forward Secrecy
Perfect Forward Secrecy (PFS) is the function of two parties agreeing on a temporary session
key that is different for each message. This provides confidence that the compromise of the
long-term private key does not compromise previous session keys. PFS prevents an
eavesdropper from being able to decrypt traffic even if the eavesdropper has the private keys
from both parties because the parties negotiate the temporary session key.