+---------------+                            +---------------+
| RefVal        |                            | RefVal        |
| Provider A    |                            | Provider B    |
| Firmware      |                            | Firmware      |
| Configuration |                            | Configuration |
| Authority     |                            | Authority     |
|               |                            |               |
+---------------+                            +---------------+
      |                                             |
      |                                             |Step 0B
      |       +------------+        +------------+  |
      |       |            | Step 1 |            |  |   \
      |       | Attester   |<------>| Verifier   |  |   |
      |       |            |<------>|            |  |   |  Router B
      +------>|            | Step 2 |            |  |   |- Challenges
       Step 0A|            |        |            |  |   |  Router A
              |            |------->|            |  |   |
              |- Router A -| Step 3 |- Router B -|  |   /
              |            |        |            |  |
              |            |        |            |  |
              |            | Step 1 |            |  |   \
              | Verifier   |<------>| Attester   |<-+   |  Router A
              |            |<------>|            |      |- Challenges
              |            | Step 2 |            |      |  Router B
              |            |        |            |      |
              |            |<-------|            |      |
              +------------+ Step 3 +------------+      /