EV-SSL

An Extended Validation Certificate (EV) is a certificate used for HTTPS websites and software that proves the legal entity controlling the website or software package. Obtaining an EV certificate requires verification of the requesting entity's identity by a certificate authority (CA). Web browsers show the verified legal identity prominently in their user interface, either before, or instead of, the domain name. During software installation, the verified legal identity is displayed to the user by the operating system (e.g., Microsoft Windows) before proceeding with the installation.

EV HTTPS certificates contain a subject with X.509 OIDs for jurisdictionOfIncorporationCountryName, businessCategory, and serialNumber, with the serialNumber pointing to the ID at the relevant secretary of state (US) or national government business registrar (outside US), as well as a CA-specific policy identifier so that EV-aware software, such as a web browser, can recognize them.

EV certificates use the same encryption as organization validated certificates and domain validated certificates: the increase in security is due to the identity validation process, which is indicated within the certificate by the policy identifier.

The criteria for issuing EV certificates are defined by the Guidelines for Extended Validation, currently (as of January 7 2017) at version 1.6.1. The guidelines are produced by the CA/Browser Forum, a voluntary organization whose members include leading CAs and vendors of Internet software, as well as representatives from the legal and audit professions.

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