Methods, networks and nodes for dynamically establishing encrypted communications between a first node having a first identification and a first private key and a second node having a second identification and a second private key. A first signal comprising information indicative of the first identification of the first node is transmitted, then, upon receipt of the first signal by the second node, a second signal comprising information indicative of the second identification of the second node and a first portion of a symmetric key is transmitted, then, upon receipt of the second signal by the first node, a third signal comprising a second portion of the symmetric key is transmitted.