This thesis describes the implementation of an anti-passback function in physical access
control systems.
It describes the characteristics of physical access control systems, it's basic building blocks
that assemble it and architectures in which they connect. Emphasis is given mostly on
characteristics, which have effect on the functionalities of an anti-passback function. Weak
resilience to communication connection outages in highly distributed systems is highlighted
ss the biggest disadvantage of the most common architectures.
An implementation of an anti-passback funcion using writing and verification of information
on RFID (Radio Frequency Identification) media is described, thus solving the problem of
consistency in systems which rely on working communication connectivity.
Additional security risks of the implementation are also evaluated.
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