SSL certificate is developed on CSR (Certificate Signing Request). An encrypted text is generated on the server that carries organization details like common name, legal name of enterprise, division of the enterprise, city, state, country, email address, public key, etc. In most cases, if individual has access of his server via control panel, then CSR can be generated, which is a combination of private and public key. How you generate CSR depends on your server type therefore; we have categories method list for CSR generation on different web servers.
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Note: After October 1, 2013 all SSL certificates must have a 2048-bit key size.