** [https://en.wikipedia.org/wiki/International_Article_Number_(EAN) EAN]
** [https://en.wikipedia.org/wiki/Universal_Product_Code UPC]
* Varmenteet:
** [[X.509]]
** [https://en.wikipedia.org/wiki/Certification_path_validation_algorithm Certification path validation algorithm]
* Tunnukset
** Tunnistetun henkilön tunnus voi olla pelkkä [[SATU]], [[ETSI#PNO|Etsin PNO]]-muotoa tai [[SAML/PersonIdentifier]].