Title	SMS based Advanced Sender Authentication Mechanism for Anti-Spam based on DomainKey
Author	Jong-Won Seo, Je-Gyeong Jo, Hyung-Woo Lee
Citation	Vol. 7  No. 3  pp. 124-130
Keywords	E-mail Authentication, PGP, DomainKey, Anti-SPAM, SMS

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