  RFID tags see a widespread use in modern security systems, including home
intercoms, access control cards, etc. Here we focus on access control systems.
Currently they have either high cost or low security guarantees. Hence, the
developments focusing on improving access control security while lowering the
cost is a rapidly developing field. The purpose of this work is to create an
alternative access control scheme, where card scanners are replaced with
passive RFID tags, and all the communications are done via user's smartphone
Wi-Fi. Based on the analysis of existing approaches, it was concluded that use
of mobile systems is the most promising due to their expandability and presence
of a large number of sensors, such as NFC, camera etc. In the proposed model
RFID tags are mounted near a turnstile or a smart door. Tag reading and
programming is done via NFC chip directly on an Android or iOS mobile device,
which allows for a significant price cut for such a system implementation. A
detailed description of a tag writing procedure with the data required to
perform it is provided. To enhance security, together with smartphone-based
authorization we require the user to provide his photograph while entering a
secure gate. The photograph is then displayed on a monitoring dashboard
side-by-side with his registration picture, so that the two can then be matched
against each other. The developed client-server application offers
administrative system used to configure gate access policies and monitor
entrances with filters by access time, user and gate. Also, we propose a mobile
application that allows gate registration and serves as a door unlock key. The
suggested access control model reduces installation costs required, as it is
fully wireless and uses cheap autonomous RFID-tags as its main component.
