Diffie-Hellman Key Exchange

Method allowing two parties to establish a shared secret over an insecure channel, foundation of forward secrecy.

Core Principles & Analysis

• First published public-key technique, predating RSA.
• The 2015 Logjam attack exposed weak 512-bit export parameters.
• Ephemeral variants provide forward secrecy in TLS 1.3.

Specifications & Metrics

• INTRODUCED: 1976