[FIG(quote)[
[FIGCAPTION[
[1] [CITE@en[RFC 5280 - Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile]] ([TIME[2015-02-22 15:44:10 +09:00]] 版) <http://tools.ietf.org/html/rfc5280#section-3>
]FIGCAPTION]
>
:RA:         registration authority, i.e., an optional system to which
a CA delegates certain management functions;
]FIG]

[FIG(quote)[
[FIGCAPTION[
[2] ([TIME[2014-11-01 05:54:38 +09:00]] 版)
<https://cabforum.org/wp-content/uploads/BRv1.2.3.pdf#page=11>
]FIGCAPTION]

> Registration Authority (RA): Any Legal Entity that is responsible for identification and authentication of subjects
> of Certificates, but is not a CA, and hence does not sign or issue Certificates. An RA may assist in the certificate
> application process or revocation process or both. When “RA” is used as an adjective to describe a role or function,
> it does not necessarily imply a separate body, but can be part of the CA.

]FIG]