![]() It will require more processing power, and takes slightly longer for phase 1 and 2 to complete. Although using PFS does have its drawback however. ![]() Therefore, due to the above reason, using PFS provides a more secure VPN connection. Of course if PFS is not turned on then the current keying material already established at phase 1 will be used again to generate phase 2 SA’s. This is an extra layer of protection that PFS adds, which ensures if the phase 2 SA’s have expired, the keys used for new phase 2 SA’s have not been generated from the current phase 1 keying material. When PFS is turned on, for every negotiation of a new phase 2 SA, the two gateways must generate a new set of phase 1 keys. Any future data will not be compromised, as future data would not be associated with that compromised key.īoth sides of the VPN must be able to support PFS in order for PFS to work. This would ensure if a hacker\criminal was to compromise the private key, they would only be able to access data in transit protected by that key. PFS (Perfect Forward Secrecy) ensures the same key will not be generated and used again, and because of this, the VPN peers negotiate a new Diffie-Hellman key exchange. PFS (Perfect Forward Secrecy) - IPsec VPN Tutorial
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