The part secures profiles within and between electronic security perimeters: for IEC 61850-8-1 client-server communication it defines the non-secure, TLS-only (out of scope), TLS with ACSE authentication (mandatory) and end-to-end (optional, intended to become mandatory) MMS security profiles for control centre to substation and within the substation; VLAN-based profiles and IEC 61850-8-2 have their security correlated; and for client-server services the OriginatorID is bound to the authenticated peer through the certIssuer and originatorID data attributes (issuer name concatenated with backslash, truncated at 255, serial number copied as the identifier, NULL where not authenticated).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.