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We propose a secure and resilient WSN roadside architecture for intelligent transport systems which supports the two complementary services accident prevention and postaccident investigation. Our WSN security architecture is stimulated by the understanding that WSN roadside islands will only be rolled-out and used when hardware costs are close to the minimum. We provide a purely software based security solution which does not rely on costly HW components like road side units (RSU) or tamper resistant modules on sensor nodes. We use existing components, but also describe protocols that may be of independent interest.

Recently, several code update approaches for multihop sensor networks have been proposed basically addressing two orthogonal problems: security and efficient over the air reprogramming. Unfortunately, the proposed security solutions for code update mechanisms are only considering early proposed over the air reprogramming solutions like e.g. Deluge or MOAP. Therefore, currently available symmetric key based secure code update schemes are not per se suited to support advanced coding techniques such as Fountain Codes. In this work, we provide means to secure this promising technique mainly with efficient symmetric cryptographic primitives and demonstrate its applicability for efficient and robust over the air reprogramming.

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