What is the Diffie-Hellman group?

What is the 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.

What is a MODP group?

Abstract This document defines new Modular Exponential (MODP) Groups for the Internet Key Exchange (IKE) protocol. It documents the well known and used 1536 bit group 5, and also defines new 2048, 3072, 4096, 6144, and 8192 bit Diffie-Hellman groups numbered starting at 14.

What is Diffie-Hellman group in ipsec?

Diffie-Hellman—A public-key cryptography protocol that allows two parties to establish a shared secret over an unsecure communications channel. Diffie-Hellman is used within IKE to establish session keys. It supports 768-bit (the default), 1024-bit, 1536-bit, 2048-bit, 3072-bit, and 4096-bit DH groups.

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 Diffie-Hellman group should I use?

Guidelines: 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.

Which Diffie-Hellman cryptographic group is the strongest and most secure?

DH group 1 consists of a 768 bit key, group 2 consists of 1024 bit key, group 5 is 1536 bit key length and group 14 is 2048 bit key length. Group 14 is the strongest and most secure of the ones just mentioned, but there are other key lengths as well.

Which is the strongest Diffie Hellman key exchange?

Which Diffie Hellman Group choices are no longer recommended?

24—Diffie-Hellman Group 24: 2048-bit MODP group with 256-bit prime order subgroup. This option is no longer recommended.

Where is Diffie-Hellman used?

key exchange
The Diffie-Hellman algorithm is mostly used for key exchange. Although symmetric key algorithms are fast and secure, key exchange is always a problem. You have to figure out a way to get the private key to all systems. The Diffie-Hellman algorithm helps with this.

When to use Diffie Hellman group 5 or 21?

“Guideline: 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 key length of 256 bits or greater, use Diffie-Hellman group 21.”

When to use elliptic curve Diffie Hellman groups?

That’s not practical, so instead, we are now using elliptic curve Diffie-Hellman Groups. If you are using encryption or authentication algorithms with a 128-bit key, use Diffie-Hellman groups 19, 20. If you are using encryption or authentication algorithms with a 256-bit key or higher, use Diffie-Hellman group 21.

Which is more secure MoDP or Diffie Hellman?

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. Fireware supports these Diffie-Hellman groups:

How is Diffie Hellman used in a VPN?

Diffie-Hellman (DH) allows two devices to establish a shared secret over an unsecure network. In terms of VPN it is used in the in IKE or Phase1 part of setting up the VPN tunnel. There are multiple Diffie-Hellman Groups that can be configured in an IKEv2 policy on a Cisco ASA running 9.1(3).