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The Online Certificate Status Protocol (OCSP) is an Internet protocol used for obtaining the revocation status of an X.509 digital certificate. [2] It is described in RFC 6960 and is on the Internet standards track.
X.509 certificates are used in many Internet protocols, including TLS/SSL, which is the basis for HTTPS, [2] the secure protocol for browsing the web. They are also used in offline applications, like electronic signatures. [3] An X.509 certificate binds an identity to a public key using a digital signature.
Nginx performs lazy loading of OCSP responses, which means that for the first few web requests it is unable to add the OCSP response. [ 20 ] On the browser side, OCSP stapling was implemented in Firefox 26, [ 4 ] [ 21 ] in Internet Explorer since Windows Vista , [ 22 ] and Google Chrome in Linux, ChromeOS , and Windows since Vista.
Certificate Transparency (CT) is an Internet security standard for monitoring and auditing the issuance of digital certificates. [1] When an internet user interacts with a website, a trusted third party is needed for assurance that the website is legitimate and that the website's encryption key is valid.
A classic example of TLS for confidentiality is when using a web browser to log on to a service hosted on an internet based web site by entering a password. Integrity: Assurance that if an entity changed (tampered) with transmitted data in the slightest way, it would be obvious it happened as its integrity would have been compromised.
In public key infrastructure (PKI) systems, a certificate signing request (CSR or certification request) is a message sent from an applicant to a certificate authority of the public key infrastructure (PKI) in order to apply for a digital identity certificate.
In practice, a web site operator obtains a certificate by applying to a certificate authority with a certificate signing request. The certificate request is an electronic document that contains the web site name, company information and the public key. The certificate provider signs the request, thus producing a public certificate.
ACME logo. The Automatic Certificate Management Environment (ACME) protocol is a communications protocol for automating interactions between certificate authorities and their users' servers, allowing the automated deployment of public key infrastructure at very low cost.