Each CA publishes a CRL of revoked certs. Browsers download it periodically; OCSP and CRLite are modern alternatives that scale better.
CRL
Certificate Revocation List — public list of revoked certs from a CA.
Certificate Revocation List — public list of revoked certs from a CA.
Each CA publishes a CRL of revoked certs. Browsers download it periodically; OCSP and CRLite are modern alternatives that scale better.