Once parties share information they need channels giving confidentiality, integrity and authenticity; response teams must support and use a method to secure communications with constituents and other teams at a level acceptable to the constituency. Preparation in advance is essential: public keys must be authenticated before use (web of trust or certification hierarchy), secret keys exchanged beforehand over a secure channel, and any specific verification requirement (such as calling a number to check a key) stated from the start in the template.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.