What does DH group mean?

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.

What is DH in IPSec?

Diffie-Hellman (DH) is a public -key cryptography scheme allowing two parties to establish a shared secret over an insecure communications channel. IKE uses Diffie-Hellman to create keys used to encrypt both the Internet Key Exchange (IKE) and IPSec communication channels.

Is DH Group 14 secure?

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.

Why do we use DH in ipsec?

Diffie-Hellman (D-H) is a public-key cryptography protocol. It allows two parties to establish a shared secret key used by encryption algorithms (DES or MD5, for example) over an insecure communications channel. D-H is used within IKE (described later in this article) to establish session keys.

Which Diffie Hellman group is the strongest?

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.

Is Diffie-Hellman Group 5 secure?

5—Diffie-Hellman Group 5: 1536-bit MODP group. Formerly considered good protection for 128-bit keys, this option is no longer considered good protection.

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Which is better DH groups 21 through 19 or 24?

Notice that it appears the ASA prefers DH Groups 21 through 19 over 24 – perhaps because they are more standard elliptic curve groups while group 24 is an exotic extension to older style “Modular exponentiation group?”

Which is stronger 1024 bit DH or RSA?

A summary of all this goes thus: while 1024-bit DH is somewhat stronger (theoretically) than 1024-bit RSA, the difference is slight (say, 1024-bit DH is like 1200-bit RSA at most).

What’s the difference between 1024 and 2048 bit dhe?

To be exact, it implements original DSA (FIPS 186-0) sizes of P 512 to 1024 by 64 and Q 160, not the FIPS 186-3 improvements 2048/224,256 and 3072/256, and for no good reason imposes the same limits on DH. I’ve seen a bugs.java.com entry that says this will be fixed in Java 8, but google doesn’t find it.