Perfect Forward Secrecy (PFS) Support for SSL Decryption

PFS is a secure communication protocol that prevents the compromise of one encrypted session from leading to the compromise of multiple encrypted sessions. With PFS, a server generates unique private keys for each secure session it establishes with a client. If a server private key is compromised, only the single session established with that key is vulnerable—an attacker cannot retrieve data from past and future sessions because the server establishes each connected with a uniquely generated key. The firewall decrypts SSL sessions established with PFS key exchange algorithms, and preserves PFS protection for past and future sessions.
Support for Diffie-Hellman (DHE)-based PFS and elliptical curve Diffie-Hellman (ECDHE)-based PFS is enabled by default (
Decryption Profile
SSL Decryption
SSL Protocol Settings
If you use the DHE or ECDHE key exchange algorithms to enable PFS support for SSL decryption, you can use a hardware security module (HSM) to store the private keys for SSL Inbound Inspection.
When you configure SSL Inbound Inspection and use a PFS cipher, session resumption is not supported.

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