Triple diffie-hellman

1. What is triple Diffie-Hellman?
2. What is X25519 encryption?
3. Is Diffie-Hellman key exchange still used?
4. What are Diffie-Hellman groups?

What is triple Diffie-Hellman?

This document describes the "X3DH" (or "Extended Triple Diffie-Hellman") key agreement protocol. X3DH establishes a shared secret key between two parties who mutually authenticate each other based on public keys. X3DH provides forward secrecy and cryptographic deniability.

What is X25519 encryption?

X25519 is an elliptic curve Diffie-Hellman key exchange using Curve25519. It allows two parties to jointly agree on a shared secret using an insecure channel.

Is Diffie-Hellman key exchange still used?

The Diffie-Hellman key exchange was one of the most important developments in public-key cryptography and it is still frequently implemented in a range of today's different security protocols.

What are Diffie-Hellman groups?

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: MODP. Diffie-Hellman Group 1 (768-bit)