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Entity within the public key infrastructure (PKI) that authenticates the identity and the organizational affiliation of the users.
an entity that acts an intermediary between the CA and a prospective certificate subject; the CA trusts the ORA to verify the subject's identity and that the subject possesses the private key corresponding to the public key to be bound to that identity in a certificate. Note that equivalent functions are referred to as Local Registration Authority (LRAs) or Registration Authorities (RAs) in some documents.
NIST SP 800-15 under Organizational Registration Authority (ORA)