Identification of nodes via Arduino sketch

Hi,

I am trying to implement key distribution scheme in 3 Xbee+Arduino based nodes. If I assume one node as Node 1 (A) and another 2 as Node 2 (B) and Node 3 (C), I want to distribute the authentication to these nodes.

My main concern now is Identification of the nodes. I don’t know how Node 1 will refer to Node 2 and 3. I will be using other related sketch in arduino and that’s why I need to know arduino sketch by which I can identify a particular node and when needed refer to that node only. As an example if B wants to communicate with A only and then again wants to send some data to C only instead of A, how will it know the ID of the nodes and accomplish it’s job?

I want to distribute the authentication to these nodes.

The authentication of what?

I don’t know how Node 1 will refer to Node 2 and 3.

Each node has an address. The types of XBee at each node is important but undisclosed.

Using API mode and the XBee library makes it trivial to send data to a specific node and to know which node a packet is from.