This document, D4.1, is the result of WP4 activities and is a key deliverable of the project. A high-level security functional architecture is defined that identifies the key functional blocks designed to offer secure data delivery across RINA infrastructure. The functional decomposition of the architecture identifies and details the various internal RINA functions embedded in Inter Process Communication (IPC) processes, and Distributed Application Facilities (DAFs)/ Distributed IPC Facilities (DIFs) that support the network in secure delivery of data.