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Which Diffie-Hellman group is 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.
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.
What are the different Diffie-Hellman groups?
dh-group —Diffie-Hellman group for key establishment.
- group1 —768-bit Modular Exponential (MODP) algorithm.
- group2 —1024-bit MODP algorithm.
- group5 —1536-bit MODP algorithm.
- group14 —2048-bit MODP group.
- group15 —3072-bit MODP algorithm.
- group16 —4096-bit MODP algorithm.
Is Diffie Hellman Group 14 secure?
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:
Which is the Diffie Hellman group for IPsec?
The Diffie Hellman Groups I can select from include 14 = 2048-bit MODP group 19 = 256-bit random ECP group 20 = 384-bit random ECP group 21 = 521-bit random ECP group 24 = 2048-bit MODP Group with 256-bit Prime Order Subgroup
Can a Diffie Hellman group be used in Ike?
There are multiple Diffie-Hellman Groups that can be configured in an IKE policy on a Cisco IOS & ASA. A full list of ALL Diffie-Hellman Groups is here. Algorithms marked as AVOID do not provide an adequate security against modern threats and should not be used. AES needs stronger Diffie-Hellman Groups than DES or 3DES.
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).