Voir aussi les applications : OpenVPN, OpenPGP, etc.
Rappel produits propriétaires : MS WS Enterprise PKI, FIM, IBM, Bull, Novell, Comodo, GlobalSign, OpenTrust, Unicert, Entrust, Verisign, services infogérés, etc.
http://developer.mozilla.org/en-US/docs/PKI
http://developer.mozilla.org/en-US/docs/Introduction_to_Public-Key_Cryptography
http://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS
http://www.open-source-guide.com/Solutions/Developpement-et-couches-intermediaires/Pki
http://wiki.openstack.org/wiki/PKI
http://en.wikipedia.org/wiki/Public_key_infrastructure
http://en.wikipedia.org/wiki/Category:Cryptographic_software
http://fr.wikipedia.org/wiki/Infrastructure_%C3%A0_cl%C3%A9s_publiques
(compléter : RFC list)
http://www.pcmag.com/article2/0,2817,2472334,00.asp
http://www.linux.com/learn/tutorials/838235-how-to-best-manage-encryption-keys-on-linux