Title	PEPSI (Privacy-Enhanced Permanent Subject Identifier) Embedded in X.509 Certificate
Author	Jaeil Lee, JongWook Park, Seungjoo Kim, JooSeok Song
Citation	Vol. 6  No. 6  pp. 204-208
Keywords	PKI, X.509, Certificate, CA, User authentication, Privacy

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