When I list the details of a key I get output like this:
$ gpg --edit-key SOMEID pub [..] created: [..] expires: [..] usage:SC [..] sub [..] created: [..] expires: [..] usage: E
usage: SCA on another key (the master-key part).
What does these abbreviation in the usage field mean?
I can derive that:
S -> for signing E -> for encrypting
But what about
And are there more?
And where to look stuff like this up?