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A DYNAMIC SECRET-BASED ENCRYPTION SCHEME FOR SMART GRID
WIRELESS COMMUNICATION
ABSTRACT:
Integrating information network into power system is the key for realizing the vision of smart
grid, but also introduces many security problems. Wireless communication offers the benefits of
low cost, rapid deployment, shared communication medium, and mobility; at the same time, it
causes many security and privacy challenges. In this paper, the concept of dynamic secret is
applied to design an encryption scheme for smart grid wireless communication. Between two
parties of communication, the previous packets are coded as retransmission sequence, where
retransmitted packet is marked as “1” and the other is marked as “0.” During the communication,
the retransmission sequence is generated at both sides to update the dynamic encryption key.
Any missing or misjudging in retransmission sequence would prevent the adversary from
achieving the keys. In our experiments, a smart grid platform is built, employing the ZigBee
protocol for wireless communication. And a dynamic secret-based encryption demo system is
designed based on this platform. The experiment results show that the retransmission and packet
loss in ZigBee communication are inevitable and unpredictable, and it is impossible for the
adversary to track the updating of the dynamic encryption key.