Home Online Certificates What Is Online Certificate Status Protocol?

What Is Online Certificate Status Protocol?

The Online Certificate Status Protocol (OCSP) is an Internet protocol used for obtaining the revocation status of an X.509 digital certificate. It is described in RFC 6960 and is on the Internet standards track. It is one way that a website operator can protect his users from accessing websites that use compromised certificates. The OCSP gives users a more up-to-date picture of compromised certificates than they might obtain using CRLs alone, which are usually updated at predetermined intervals.

OCSP stapling has better performance characteristics than fetching an OCSP response on every new TLS connection, because the OCSP response does not have to be sent over the network every time. Web browsers also often respond with an error code if they are unable to retrieve an OCSP response at all.

The Online Certificate Status Protocol is a protocol used for obtaining the revocation status of an X.509 digital certificate

OCSP is an Internet protocol that allows a client to request the revocation status of a digital certificate from a certificate authority (CA). It is used as part of the X.509 public-key infrastructure (PKI) to verify if a particular certificate has been revoked, and can be used by web browsers, web servers, and CAs.

OCSP was first defined in 1999 in RFC 2560 – “The Online Certificate Status Protocol”. OCSP is specified in RFC 6960 – “Extensions to the Certificate Management Protocol (CMP) for Remotely Managing Trust Anchor Operations” and RFC 6961 – “The Transport Layer Security (TLS) Protocol Version 1.3”.

The Online Certificate Status Protocol is an Internet protocol used for obtaining the revocation status of an X.509 digital certificate

The Online Certificate Status Protocol is an Internet protocol used for obtaining the revocation status of an X.509 digital certificate. It is defined in RFC 2560 and RFC 6277, published by the Internet Engineering Task Force (IETF).

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The OCSP was designed to provide a more efficient alternative to managing revocation lists than CRLs, which require every CA’s certificate chain to be downloaded before checking if it has been revoked or not. The OCSP allows clients to check whether their certificates are valid online by connecting directly with the CA that issued them, instead of downloading a large list from all the issuing CAs in order to verify if a particular certificate has expired or not.

The OCSP allows a system to make basic authentication checks without having to download and store a certificate revocation list (CRL)

The OCSP allows a system to make basic authentication checks without having to download and store a certificate revocation list (CRL). A client requests the status of the specified certificate from the OCSP responder, which replies with one of three possible status values:

  • good – The OCSP response contains an acceptable serial number for that certificate.
  • revoked – The serial number does not match an acceptable serial number for that certificate.
  • unknown – A problem occurred communicating with the OCSP responder, or there is no information available about this particular certificate yet.

It is one way that a website operator can protect his users from accessing websites that use compromised certificates

OCSP is one way that a website operator can protect his users from accessing websites that use compromised certificates. One of the biggest problems with OCSP is that it requires connections between the user’s browser and the certificate authority (CA) in order to check whether or not a certificate has been revoked. This means that if you’ve got a large number of visitors, this process can take up a significant amount of bandwidth and resources on your server.

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To avoid these issues, an alternative has been developed—OCSP stapling. OCSP stapling allows CAs to attach their latest revocation information to all new certificates issued by them so that browsers no longer need to make a separate connection just for this purpose. This not only reduces the load placed on both parties’ resources but also makes sure they don’t miss out on any important updates if something happens with either party during this time period—after all, why would you want someone who trusted your site enough before visiting again after finding out about its vulnerability?

The OCSP gives users a more up-to-date picture of compromised certificates than they might obtain using CRLs alone, which are usually updated at predetermined intervals

The OCSP responses are usually updated more frequently than CRLs, but they’re not always available. The OCSP responses tend to be much larger than CRLs and so can take longer to download.

OCSP stapling has better performance characteristics than fetching an OCSP response on every new TLS connection, because the OCSP response does not have to be sent over the network every time.

OCSP stapling is a technique used to speed up TLS connections. Instead of fetching an OCSP response on every new TLS connection, the OCSP response is sent along with the certificate and thus doesn’t have to be fetched from the network every time. This has better performance characteristics than fetching an OCSP response on every new TLS connection, because the OCSP response does not have to be sent over the network every time.

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Web browsers also often respond with an error code if they are unable to retrieve an OCSP response at all

You may receive an error message such as “OCSP response not found” or “OCSP Error: no status available” if you try to verify the revocation status of a certificate using OCSP.

Under typical usage, OCSP clients perform only one HTTPS request rather than two when validating a certificate, and no CRL downloads are necessary.

OCSP is a protocol used to check the revocation status of a certificate. OCSP clients perform only one HTTPS request rather than two when validating a certificate, and no CRL downloads are necessary.

Under typical usage, OCSP clients perform only one HTTPS request rather than two when validating a certificate, and no CRL downloads are necessary. This is because OCSP responses contain information about whether or not the certificate has been revoked (rather than just listing it in an online list).

Conclusion

Online Certificate Status Protocol (OCSP) is a protocol that allows you to check the status of an issued certificate. It relies on an OCSP responder that is able to digitally sign responses and provide information about a certificate’s revocation status. This means you can use OCSP to make real-time decisions about whether or not your device should connect with another device over SSL/TLS connections before the handshake is complete.

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