  Device-to-device (D2D) communication is one of the most recent advancements
in wireless communication technology. It was introduced in cellular
communication technology by the 3rd Generation Partnership Project (3GPP) to
lay a foundation for the evolving 5G architecture. It has now emerged as a
promising technology for proximate devices. It enables proximate devices to
communicate directly without the involvement of a third party network
infrastructure. Researchers are analysing various methods to facilitate the
smooth integration of D2D communication technology into the existing network
system architecture. This paper lists all the different possible modes of
operation in D2D communication based on the varying use-case scenarios and
highlights the security and privacy requirements for D2D communication. Some of
the recent authentication proposals for D2D communication technology are
further reviewed, and their security and privacy capabilities are analysed.
Apart from authentication, we also reviewed some recent proposals of access
control in D2D and highlighted the security issues addressed. We then
identified the open issues that prevail in implementing D2D technology in a
real-world scenario for future researchers, emphasising the existing
authentication and access control techniques in D2D communication.
