A smart meter measures the consumption of certain commodities, such as electricity, gas or water and communicates them to a remote entity. Beside the measurements used for later billing, control and management data as well as the actual consumption of the household may be transmitted. This data is necessary to control and efficiently use the future Smart Grid. The communication is typically done over public networks, which makes it prone to attacks such as tampering of the measurement data, sending manipulated control information to the Smart Meter etc. The first line of defense in a smart metering infrastructure is the gateway, which is the communication interface between the home area network and the wide area network. To make the overall infrastructure secure, it is very necessary to secure the gateway at first. More often the developers of smart metering system are not security experts and there is a need of expert knowledge for a sense of security in the system. Such expert knowledge can be gathered in the form of security patterns. A set of three security patterns, namely secure remote readout, key manager for the gateway and wakeup service, is introduced in this paper. This set will be enriched further in the future for a trustable system.
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