Why Do I Need Cisco MASA?
The Cisco MASA service securely authorizes ownership of a router so that the router can then establish a secure connection to the router owner's (your) network infrastructure.
The establishment of the ownership of the router is achieved through an authentication workflow that on successful completion generates an ownership voucher (OV). The primary purpose of the OV is to securely convey a certificate—the "pinned-domain-cert" (PDC), that the router can then use to authenticate subsequent interactions with the network, for example, secure bootstrapping. Establishing ownership is important to the bootstrapping mechanisms so that the router can authenticate the network that is trying to take control of it.