A Novel Distributed Authentication Framework for Single Sign-On Services. - Kaleb Brasee; S. Kami Makki; Sherali Zeadally (SUTC, 2008)

A secure two-factor authentication scheme for single sign-on services. - Kaleb Brasee; S. Kami Makki; Sherali Zeadally (Secur. Commun. Networks, 2009)