What uses an Elliptic Curve key exchange algorithm?

ECDSA (Elliptic Curve Digital Signature Algorithm) uses elliptic curves for digital signatures and authentication, not for key exchange.

ECDHE stands for Elliptic Curve Diffie-Hellman Ephemeral and is specifically a key exchange algorithm that uses elliptic curve cryptography to establish a shared secret between two parties. The ephemeral aspect means new key pairs are generated per session, providing perfect forward secrecy. It is widely used in TLS handshakes to negotiate session encryption keys.

AES-GCM is a symmetric block cipher mode used for bulk data encryption and authenticated encryption, not a key exchange algorithm.

SHA (Secure Hash Algorithm) is a cryptographic hash function used for data integrity verification and digital signatures, not key exchange.