What is a certificate signing request?

CSR (Certificate Signing Request) is a data format that bundles a public key together with some metadata about the key’s entity. Clients don’t interpret certificate signing requests (CSR) but Certificate Authorities interpret CSR.

When the server seeks to have a CA vouch for the web server’s public key, the server sends the CA a CSR. The CA validates the information in the CSR and uses it to generate a certificate. The CA then sends the final certificate or a certificate chain and private key on the web server.

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