ECDHE
acronymcryptography
Stands for: Ephemeral Elliptic-Curve Diffie-Hellman
A key-exchange method that gives every session its own throwaway keys, so past traffic stays safe if a long-term key leaks.
Ephemeral Elliptic-Curve Diffie-Hellman (RFC 8422) is the standard forward-secret key exchange in modern TLS. The 'ephemeral' part means the keys exist only for one session, which is what provides forward secrecy; the elliptic-curve part makes it fast with small keys.
Also known as: ecdhe, ECDHE_ECDSA, ECDHE_RSA