Tagged: `key-exchange`

7 entries

Diffie-HellmanGlossary · Diffie-Hellman is the 1976 key-exchange protocol that lets two parties derive a shared secret over a public channel, with security that Shor's algorithm breaks.
Forward secrecyGlossary · Forward secrecy keeps past session keys safe if long-term keys leak later, but it does not protect recorded traffic from future quantum decryption.
Key encapsulation mechanism (KEM)Glossary · A key encapsulation mechanism (KEM) uses a public key to establish a shared secret, the primitive that replaces Diffie-Hellman in post-quantum protocols.
Key exchangeGlossary · Key exchange lets two parties establish a shared secret over a public channel; quantum-vulnerable Diffie-Hellman variants are giving way to KEMs.
Post-quantum SSHMigration · Post-quantum SSH covers OpenSSH hybrid key exchange, sntrup761x25519 since 2022 and ML-KEM based mlkem768x25519, protecting sessions from future quantum attack.
Quantum key distribution (QKD)Foundations · Quantum key distribution (QKD) uses quantum physics to share encryption keys; the NSA and UK NCSC recommend post-quantum cryptography instead.
X25519Glossary · X25519 is the Curve25519 Diffie-Hellman function; TLS now pairs it with ML-KEM in hybrid groups such as X25519MLKEM768 for post-quantum key exchange.