WISTP edition:10 location:Heraklion, Greece date:26-27 September 2016
Due to ongoing changes in the power grid towards decentralised and
highly volatile energy production, smart electricity meters are required to provide
and timely remote access to consumption and
production data. This enables flexible tariffing and dynamic load
optimisation. As the power grid forms part of the critical infrastructure
of our society, increasing the resilience of the grid's software components
against failures and attacks is vitally important.
In this paper we explore the use of Protected Module Architectures (PMAs)
to securely implement and deploy software for smart electricity meters.
Outlining security challenges and an architectural solution in the light of
security features provided by PMAs, we evaluate a proof-of-concept
implementation of a security-focused smart metering scenario. Our
implementation is based on Sancus, an embedded PMA for low-power
microcontrollers. The evaluation of our prototype provides strong
indication for the feasibility of implementing a PMA-based high assurance
smart meter with a very small software Trusted Computing Base, which would
be suitable for security certification and formal verification.