Terminology

Common Name (CN)

Also known as the Fully Qualified Domain Name (FQDN), is the characteristic value within a Distinguished Name. Typically composed of Host Domain Name and looks like, “www.symantec.com” or “symantec.com”

Certificate Signing Request (CSR)

In public key infrastructure (PKI) systems, a certificate signing request (also CSR or certification request) is a message sent from an applicant to a certificate authority in order to apply for a digital identity certificate. It usually contains the public key for which the certificate should be issued, identifying information (such as a domain name) and integrity protection (e.g., a digital signature). The most common format for CSRs is the PKCS #10 specification and another is the Signed Public Key and Challenge SPKAC format generated by some web browsers.

Public Key Infrastructure (PKI)

public key infrastructure (PKI) is a set of roles, policies, and procedures needed to create, manage, distribute, use, store & revoke digital certificates and manage public-key encryption. The purpose of a PKI is to facilitate the secure electronic transfer of information for a range of network activities such as e-commerce, internet banking and confidential email. It is required for activities where simple passwords are an inadequate authentication method and more rigorous proof is required to confirm the identity of the parties involved in the communication and to validate the information being transferred.[1]

Certificate Authority (CA)