What is MODP group?

What is MODP group?

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.

Is DH 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.

What is PFS group IPsec?

PFS guarantees that the encryption keys for IPsec SA negotiations are created separately for each negotiation. It is possible to configure the IKE SA negotiations to occur less frequently than IPsec SA negotiations to improve performance.

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).

Which 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 is Diffie-Hellman Group 1?

Diffie-Hellman public key cryptography is used by all major VPN gateway’s today, supporting Diffie-Hellman groups 1,2, 5, 14 as well as others. 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.

Should you use PFS?

You don’t have to use PFS if you don’t want to, you can just leave it disabled. However if you are protecting sensitive data, then it should be enabled and is best practice and recommended to use it.

How often does a modp8192 group take place?

Exempli gratia, the use of modp8192 group can take several seconds even on very fast computer. It usually takes place once per phase 1 exchange, which happens only once between any host pair and then is kept for long time. PFS adds this expensive operation also to each phase 2 exchange.

Which is the 8192 bit MoDP group ID?

8192-bit MODP Group This group is assigned id 18. This prime is: 2^8192 – 2^8128 – 1 + 2^64 * { [2^8062 pi] + 4743158 } Kivinen & Kojo Standards Track [Page 6]

Is the 1536 MoDP group defined in RFC 2409?

RFC 3526 MODP Diffie-Hellman groups for IKE May 2003 2. 1536-bit MODP Group The 1536 bit MODP group has been used for the implementations for quite a long time, but was not defined in RFC 2409 (IKE). Implementations have been using group 5 to designate this group, we standardize that practice here.