Title	User’s authorization in singularity operating system
Author	Rami Matarneh, Suha Al_Jubori
Citation	Vol. 9  No. 2  pp. 439-445
Keywords	Access Controller, Certificate Authority, Access Control Lists, Singularity

Title	X. 509 and PGP Public Key Infrastructure methods: A critical review
Author	Shahin Fatima, Shish Ahmad, Shadab Siddiqui
Citation	Vol. 15  No. 5  pp. 55-59
Keywords	public key infrastructure, X.509 certificate, certificate authority (CA), PGP format, authentication, confidentiality