In the past few years secure information sharing became very popular in the area of
immigration military applications healthcare education foreign affairs etc. As secure
communication utilizes both wireless and wired communication mechanizations for exchanging
sensitive information security and privacy of the information exchange cannot be easily
compromised. To moderate the security integrity authenticity and privacy issues related to
information exchange numerous authentication mechanisms have been recommended by different
researchers in the literature in recent times but these are vulnerable to prospective security
flaws such as masquerade insider replay impersonation password guessing server spoofing
denial-of-service attacks and in addition have failed to deliver mutual authentication. In
the past few years we have also witnessed a balanced growth in the acceptance of VoIP (Voice
over IP) facilities because the numerous Web and VoIP applications depend on huge and extremely
distributed infrastructures to process requests from millions of users in an appropriate
manner. Due to their extraordinary desires these large-scale internet applications have
frequently surrendered security for other objectives such as performance scalability and
availability. As a result these applications have characteristically favored weaker but
well-organized security mechanisms in their foundations. Session Initiation Protocol (SIP) is
an application and presentation layers signaling protocol that initiates modifies and
terminates IP-based multimedia sessions. Implementing SIP for secure communication has been a
topic of study for the past decade and several proposals are available in the research domain.
However security aspects are not addressed in most of these proposals because SIP is exposed
to several threats and faces security issues at these layers. Probes for SIP (Session
Initiation Protocol) servers have been conveyed for many years. To gather more details about
these activities the author has designed a scheme for SIP servers in a network and composed
data about some popular attacks. Furthermore he explains his interpretations and guidance on
how to prevent these attacks from being successful. Biometrics a new field of research has
also been dealt with in this research by means of a three-factor authentication scheme in
which one factor is biometrics.
