Online Certificate Status Protocol is the technology would he use.
OCSP is one of the two often employed techniques for maintaining the security of a server and other network resources. In some circumstances, OCSP has superseded an outdated mechanism called a certificate revocation list.
Although the status of TLS certificate revocation can be checked using both OCSP and CRLs, their workings are very different. While a CRL displays all the revoked certificates, OCSP provides the revocation status of the individual website that the browser requested.
Thus, it is Online Certificate Status Protocol.
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