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The OCSP responder looks in a CA database that Carol maintains. In this scenario, Carol's CA database is the only trusted location where a compromise to Alice's certificate would be recorded. Carol's OCSP responder confirms that Alice's certificate is still OK, and returns a signed, successful 'OCSP response' to Bob.
OCSP stapling is designed to reduce the cost of an OCSP validation, both for the client and the OCSP responder, especially for large sites serving many simultaneous users. However, OCSP stapling supports only one OCSP response at a time, which is insufficient for certificate chains with intermediate CA certs. [26] [27]
It also introduces latency to connections, as the responder must be queried before a new connection can be used. [18] A 2018 study found that 1.7% of requests to responders were unavailable at the network level, and a further c. 2% produced unusable OCSP responses, with significant hetereogeneity across CAs and client vantage points. [32]
The ISRG provides free and open-source reference implementations for ACME: certbot is a Python-based implementation of server certificate management software using the ACME protocol, [6] [7] [8] and boulder is a certificate authority implementation, written in Go. [9] Since 2015 a large variety of client options have appeared for all operating ...
The SCVP server's response contains a set of certificates making up a valid path between the certificate in question and one of the trusted certificates. The response may also contain proof of revocation status, such as OCSP responses, for the certificates in the path. Once a certification path has been constructed, it needs to be validated.
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To reduce the amount of network traffic required for certificate validation, the OCSP protocol may be used instead. While a validation authority is capable of responding to a network-based request for a CRL, it lacks the ability to issue or revoke certificates.
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