Elliptic-curve Diffie–Hellman
Elliptic-curve Diffie–Hellman ( ECDH ) is a key agreement protocol that allows two parties , each having an elliptic-curve public–private key pair , to establish a shared secret over an insecure channel . 
<triplet> Elliptic-curve Diffie–Hellman <subj> key agreement <obj> instance of