- do not use the term 'cross-signing keys' anymore: Previously, the term
'cross-signing keys' was used to refer to the master, user-signing and
self-signing keys. This is not ideal since the master key is used for
cross-signing but may also be used to sign the backup key, for example.
In these contexts, the master key is not used for cross-signing.
The term 'cross-signing keys' has therefor been replaced by 'keys used
for cross-signing' or, more explicitely, by 'master, user-signing and
self-signing key'.
- the naming of the master key has been harmonised (no more 'master
cross-signing key' or 'master signing keys'). Also the abbr. 'MSK' has been
replaced by 'MK'.
- in the QR code example, the term 'cross-signing key' has been replaced
by 'master key' since in mode 0x00, the current user's own master key and
what the device thinks the other user's master key is used.
- it has been made more explicit that private keys used for cross-signing can
be stored on the server are stored as described in the secrets module (as
opposed to store them in unencrypted form)
Signed-off-by: codedust <codedust@so.urceco.de>