How Many Bits Do the DH Groups Used by VPN Have?

The Diffie-Hellman (DH) groups determine the strength of the key used in the key exchange process. Higher DH group numbers are usually more secure, but extra time is required to calculate the key.

Table 1 lists the bits corresponding to the DH groups used by VPN.

**Table 1** Bit corresponding to each DH group
DH Group	Modulus
1	768 bits
2	1024 bits
5	1536 bits
14	2048 bits
15	3072 bits
16	4096 bits
19	ecp256 bits
20	ecp384 bits
21	ecp521 bits

The following DH algorithms have security risks and are not recommended: DH group 1, DH group 2, and DH group 5.

Parent topic: VPN Negotiation and Interconnection

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