Credential Service Provider definition in Computer Security terms:
Definition(s): A trusted entity that issues or registers Subscriber tokens and issues electronic credentials to Subscribers. The CSP may encompass Registration Authorities (RAs) and Verifiers that it operates. A CSP may be an independent third party, or may issue credentials for its own use.
Source(s): NIST SP 800-63-2
CNSSI 4009-2015 (NIST SP 800-63-2)
reference: CSRC Glossary