Smart grid network facilitates reliable and
efficient power generation and transmission. The power system can adjust the
amount of electricity generated based on power usage information submitted by
end users. Sender authentication and user privacy preservation are two
important security issues on this information flow. In this paper, we propose a
scheme such that even the control center (power operator) does not know which
user makes the requests of using more power or agreements of using less power
until the power is actually used. At the end of each billing period (i.e. after
electricity usage), the end user can prove to the power operator that it has
really requested to use more power or agreed to use less power earlier. To
reduce the total traffic volume in the communications network, our scheme
allows gateway smart meters to help aggregate power usage information, and the
power generators to determine the total amount of power that needs to be
generated at different times. To reduce the impact of attacking traffic, our
scheme allows gateway smart meters to help filter messages before they reach
the control center. Through analysis and experiments, we show that our scheme
is both effective and efficient.
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