ABSTRACT
Security of SCADA (supervisory Control and Data Acquisition) has become a challenging issue today because of its
connectivity with the outside world and remote access to the system. One major challenge in the SCADA systems is securing
the data over the communication channel. PKI (public key infrastructure) is a well known framework for securing the
communication. In SCADA system, due to limited bandwidth and rare communications among some RTUs (Remote Terminal
Units), there is a need of customization of general PKI which can reduce the openness of Public Key, frequent transfer of
certificates and reduction in DOS (Denial of Service) attacks at MTUs (Master Terminal Units) and RTUs. This paper
intends to address the issues of securing data over communication channel in the constrained environment and presents
the novel solutions pivoted on key distribution and key management schemes. This paper also presents a set of innovative
methods of multicast and broadcast of messages in SCADA system.
Keywords: Broadcasting, Key Distribution and Management, Multicasting, Public Key Infrastructure, SCADA security