ZyXEL Communications NWD-210N - FOR MAC V1.00 Guida Utente Pagina 146

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Chapter 18 IPSec VPN
NBG5715 User’s Guide
146
18.7.9 Diffie-Hellman (DH) Key Groups
Diffie-Hellman (DH) is a public-key cryptography protocol that allows two parties to establish a
shared secret over an unsecured communications channel. Diffie-Hellman is used within IKE SA
setup to establish session keys. 768-bit, 1024-bit 1536-bit, 2048-bit, and 3072-bit Diffie-Hellman
groups are supported. Upon completion of the Diffie-Hellman exchange, the two peers have a
shared secret, but the IKE SA is not authenticated. For authentication, use pre-shared keys.
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