Complex sentence: An Extended Validation Certificate (EV) is an X.509 public key certificate issued according to criteria requiring extensive verification of the requesting entity's identity by the certificate authority (CA) before a certificate is issued.
Split into simpler sentences: An Extended Validation Certificate (EV) is an X.509 public key certificate issued according to a specific set of identity verification criteria. These criteria require extensive verification of the requesting entity's identity by the certificate authority (CA) before a certificate is issued.