Cyber Security

SAN (Subject Alternative Name)

Subject Alternative Name (SAN) is an extension to X.509 that allows various values to be associated with a security certificate using a subjectAltName field. These values are called Subject Alternative Names (SANs). Names include:

  • Email addresses
  • IP addresses
  • URIs
  • DNS names (this is usually also provided as the Common Name RDN within the Subject field of the main certificate.)
  • directory names (alternative Distinguished Names to that given in the Subject)
  • other names, given as a General Name: a registered object identifier followed by a value
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