scope:

This document is the second part of a two-part standard, sets forth the guidance and provisions available to airlines and datalink service providers for the life-cycle management of the cryptographic keys that are necessary for proper and secure operation of ACARS Message Security. The security provisions contained in Part 1 of this specification supports the use of either public/private (i.e., asymmetric) keys or a shared secret (i.e., symmetric) key for secure session initiation and key establishment between communicating peer aircraft and ground entities. This document provides guidance and provisions appropriate for the life-cycle key management of each approach.