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Certification Authority, an RFC4210 concept that models the bunch of
software and hardware that creates X509 certificates (see
L<Crypt::OpenSSL::CA::Resources/STANDARDS>). Unfortunately, the term CA
is also used in other places, and in a very confusing fashion, to
designate either

=over

=item *

the set of the cryptographic credentials (key and CA certificate) that
the CA-as-a-computing-equipment needs to perform,

=item *

the whole security domain (more computers and programs) that it relies
on and operates for (which typically includes one or several L</RA>s),

=item *

the political domain (e.g. a company) that its signature vouches for;