Perfect Forward Secrecy is a feature of specific key agreement protocols that gives assurances your session keys will not be compromised even if the private key of the server is compromised. By generating a unique session key for every session a user initiates, even the compromise of a single session key will not affect any data other than that exchanged in the specific session protected by that particular key. Perfect Forward Secrecy represents a huge step forwards in protecting data on the transport layer and following on from Heartbleed, everyone using SSL/TLS should be looking to implement it.
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