A CSR or Certificate Signing request is a block of encoded text that is submitted to a Certificate Authority (CA) for a Signed Digital Certificate. The certificate authority will use a CSR to sign and create the Digital certificate. The CSR doesn't contain the Private Key. Remember that the Private Key is always secret and remains private to you. The certificate created with a particular CSR will only work with the private key that was generated with it. So if you lose the private key, the certificate will no longer work. More Read : Want to know how SSL handshake works? Read the Article. TLS 1.3 Introduction. Read the Article. So what are the information contains in a CSR? Common Nam e : The Fully Qualified Domain Name (FQDN) of the Server. Organization : Name of your company or organization. Organizational Uni t : Department name City/Locality : City information State/County/Region : State or Region Information Country : Country information in ISO