Bundle Protocol (BP) Secure Advertisement and Neighborhood Discovery (SAND)

This document defines the Secure Advertisement and Neighborhood Discovery (SAND) protocol for Bundle Protocol version 7 (BPv7) within a delay-tolerant network (DTN). This protocol defines a general purpose advertisement mechanism with an initial set of message and data types able to be advertised by participating nodes in a BPv7 network. The focus of this document is for advertisement to topological neighbors about local neighborhoods but can be expanded upon in the future through extension points.