È il cerchio della fiducia:
o sei dentro o sei fuori!
Robert De Niro a Ben Stiller in "Ti presento i miei"
Si può assegnare fiducia ad un identificativo (alla sua chiave) tramite il comando
trust
nel menu di gpg --edit-key
.
I livelli di fiducia sono:
unknown
Nothing is known about the owner's judgment in key signing. Keys on your public keyring that you do not own initially have this trust level.
none
The owner is known to improperly sign other keys.
marginal
The owner understands the implications of key signing and properly validates keys before signing them.
full
The owner has an excellent understanding of key signing, and his signature on a key would be as good as your own.
ultimate
Solo nelle versioni più recenti.