    @inproceedings {JavierLopez1999b,
	title = {An User Authentication Infrastructure for Extranet Applications},
	booktitle = {IEEE International Carnahan Conference on Security Technology},
	year = {1999},
	month = {October},
	pages = {354-362},
	publisher = {IEEE Press},
	organization = {IEEE Press},
	address = {Madrid, Spain},
	abstract = {<p>An Extranet is used to connect businesses with their suppliers, customers or other businesses that share common goals in a way that automates their administrative interactions using Internet technology. The security of the communications over Internet is considered an essential feature. To guarantee secure operation the aid of some user authentication infrastructure is needed. This paper introduces a Public Key Infrastructure (PKI) and user identification scheme to be used in extranet applications. The flexibility of the system allows it to fit the usual hierarchical organization structure.</p>},
	author = {Javier Lopez and Antonio Mana and Juan J. Ortega}
}
