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CSR represents Certificate Signing Request, an integral part of an SSL certificate and is an encrypted text that an applicant sends to the Certificate Authority (CA) to validate the information for issuing the certificate.
The certificate for which you have requested will only work with the
private key generated with the CSR. The public key used in SSL certificate is also used to sign the CSR. Upon gathering CSR data, the CA creates a certificate.
CSR contains three fractions such as certificate information, a signature algorithm identifier, and a digital signature.
Content of CSR:
When you create a certificate signing request, you must fill below kind of information in your server.