What is Diffie-Hellman group?

Diffie-Hellman (DH) groups determine the strength of the key used in the key exchange process. Within a group type (MODP or ECP), higher Diffie-Hellman group numbers are usually more secure. Diffie-Hellman performance can vary by WatchGuard hardware model.

Is DH Group 20 secure?

Group 20 = 384-bit EC = 192 bits of security That is, both groups offer a higher security level than the Diffie-Hellman groups 14 (103 bits) or 5 (89 bits).

Is DH Group 14 secure?

DH with 2048 bits (group 14) has 103 bits of security That is: If a really secure VPN connection is needed, the phase 1 and phase 2 parameters should use at least Diffie-Hellman group 14 to gain 103 bits of security. Furthermore, at least AES-128 can be used, which has a security of almost 128 bits.

How many Diffie-Hellman groups are there?

One of the important protocol parameters negotiated by Internet Key Exchange (IKE) [RFC-2409] is the Diffie-Hellman “group” that will be used for certain cryptographic operations. IKE currently defines 4 groups. These groups are approximately as strong as a symmetric key of 70-80 bits.

What does Diffie-Hellman allow you to do?

The Diffie–Hellman (DH) Algorithm is a key-exchange protocol that enables two parties communicating over public channel to establish a mutual secret without it being transmitted over the Internet. DH enables the two to use a public key to encrypt and decrypt their conversation or data using symmetric cryptography.

What is Diffie-Hellman used for?

The Diffie-Hellman algorithm will be used to establish a secure communication channel. This channel is used by the systems to exchange a private key. This private key is then used to do symmetric encryption between the two systems.

What DH group should I use?

If you are using encryption or authentication algorithms with a 128-bit key, use Diffie-Hellman groups 5, 14, 19, 20 or 24. If you are using encryption or authentication algorithms with a 256-bit key or higher, use Diffie-Hellman group 21.

What DH Group 14?

diffie-hellman-group14-sha256. This key exchange uses the group14 (a 2048-bit MODP group) along with a SHA-2 (SHA2-256) hash. This represents the smallest Finite Field Cryptography (FFC) Diffie-Hellman (DH) key exchange method considered to be secure.

What is the difference between Diffie-Hellman groups?

Diffie-Hellman Groups are used to determine the strength of the key used in the Diffie-Hellman key exchange process. Higher Diffie-Hellman Group numbers are more secure, but Higher Diffie-Hellman Groups require additional processing resources to compute the key.

Is Diffie-Hellman Group Exchange sha256 safe?

Is Diffie-Hellman group 5 enough to secure a VPN tunnel?

It is not! Diffie-Hellman group 5 has only about 89 bits of security… Therefore, common firewalls implement DH group 14 which has a least a security level of approximately 103 bits. I tested such a site-to-site VPN tunnel between a Palo Alto and a Juniper ScreenOS firewall which worked without any problems.

What is the difference between Diffie-Hellman and IPsec Group 20 (PFS)?

That is, both groups offer a higher security level than the Diffie-Hellman groups 14 (103 bits) or 5 (89 bits). When using group 20 in IPsec phase 2 (PFS) with AES-256, the security level of the whole VPN connection is really 192 bit!

How secure is Diffie-Hellman group 14?

Diffie-Hellman group 5 has only about 89 bits of security… Therefore, common firewalls implement DH group 14 which has a least a security level of approximately 103 bits. I tested such a site-to-site VPN tunnel between a Palo Alto and a Juniper ScreenOS firewall which worked without any problems.

What is the difference between Diffie-Hellman group 20 and FortiGate Group 20?