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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. The CSR usually contains the public key for which the certificate should be issued ...
A limitation shared by other enrollment protocols based on PKCS#10 CSRs, e.g., EST and ACME, or even the web-based enrollment workflow of most PKI software where the requester starts by generating a key pair and a CSR in PKCS#10 format. For example ACME, which also uses PKCS#10, issues TLS certificates which by definition must be capable of ...
The format of these certificates is specified by the X.509 or EMV standard. One particularly common use for certificate authorities is to sign certificates used in HTTPS, the secure browsing protocol for the World Wide Web. Another common use is in issuing identity cards by national governments for use in electronically signing documents. [2]
RAs, however, do not sign or issue certificates (i.e., an RA is delegated certain tasks on behalf of a CA)." [4] While Microsoft may have referred to a subordinate CA as an RA, [5] this is incorrect according to the X.509 PKI standards. RAs do not have the signing authority of a CA and only manage the vetting and provisioning of certificates.
In cryptography, X.509 is an International Telecommunication Union (ITU) standard defining the format of public key certificates. [1] 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.
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.