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The ongoing convergence of Industrial Control Systems (ICSs) with the Internet introduces many challenges from security perspective. Particularly, the smart energy grid as large ICS and critical infrastructure, requires especial protection as the consequences of its failure can be severe. However, even a careful system design cannot prevent all attacks in advance. For this reason, the smart grid requires an additional line of defence that can be provided by a Collaborative Intrusion Detection System (CIDS) to detect unknown and ongoing attacks. In this paper, we describe the requirements to a CIDS for deployment in the smart grid. Furthermore, we discuss the design choices for such a system and summarize the arising challenges in the deployment of CIDSs in smart grids as well as present initial ideas to address them.

Abstract. Mobile ad-hoc networks (MANETs) are especially vulnerable to attacks because of lacking infrastructure and data transfer using radio communication. In the past various types of MANET attacks have been detected and analyzed. In this article primary attack methods (black hole, wormhole, rushing, and Sybil) to MANET routing using the Ad-hoc On-demand Distance Vector (AODV) protocol are modelled and analyzed in a consistent way. This process comprises a semi-formal analysis of pre-conditions (costs, probability of success, required skills) and resulting damage from each attack by means of attack trees. We thereby get a uniform way of modelling and analyzing various attacks to MANET routing that allows to directly compare the different attacks and to assess the risks.

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The Internet has become a key instrument for establishing and promoting product brands. Companies