What are two functions of ECDH and ECDSA? (Choose two.)

Nonrepudiation is a security property that results from using ECDSA signatures, but it is the outcome of digital signing rather than a distinct cryptographic function performed by the algorithm.

Certificate revocation is managed by external PKI mechanisms such as CRL (Certificate Revocation List) or OCSP and is not a function performed by either ECDH or ECDSA.

ECDSA (Elliptic Curve Digital Signature Algorithm) is specifically designed to generate and verify digital signatures, providing authentication and data integrity using a private key to sign and a corresponding public key to verify. It is the elliptic curve counterpart to RSA signing and is used in TLS certificates, code signing, and IKEv2 authentication.

Neither ECDH nor ECDSA directly encrypts data - ECDH produces a shared secret used to derive symmetric encryption keys, and ECDSA only signs and verifies; bulk encryption is performed by separate symmetric algorithms such as AES.