layered-attester.txt

    .-------------.   Endorsement for ROM
    |  Endorser   +-----------------------.
    '-------------'                       |
                                          v
    .-------------.   Reference      .----------.
    | Reference   |   Values for     |          |
    | Value       +----------------->| Verifier |
    | Provider(s) | ROM, bootloader, |          |
    '-------------'    and kernel    '----------'
                                           ^
.-------------------------------------.    |
|                                     |    |
|   .----------------------------.    |    |
|   | Kernel(C)                  |    |    |
|   |                            |    |    | Layered
|   |   Target                   |    |    | Evidence
|   | Environment                |    |    |   for
|   '----------------+-----------'    |    | bootloader
|            Collect |                |    |   and
|            Claims  |                |    | kernel
|   .----------------|-----------.    |    |
|   | Bootloader(B)  v           |    |    |
|   |              .-----------. |    |    |
|   |   Target     | Attesting | |    |    |
|   | Environment  |Environment+-----------'
|   |              |           | |    |
|   |              '-----------' |    |
|   |                  ^         |    |
|   '---------------+--|---------'    |
|           Collect |  | Evidence for |
|           Claims  v  | bootloader   |
|   .------------------+---------.    |
|   | ROM(A)                     |    |
|   |                            |    |
|   |                Attesting   |    |
|   |               Environment  |    |
|   '----------------------------'    |
|                                     |
'-------------------------------------'