engleski

Multichannel Protocols for User-Friendly and Scalable Initialization of Sensor Networks

We consider the classical problem of establishing initial security associations in wireless sensor networks. More speci cally, we focus on pre-deployment phase in which sensor nodes have not yet been loaded with shared secrets or other forms of authentic information. In this paper, we propose two novel multichannel protocols for initialization of large scale wireless sensor networks. The first protocol uses only secret key cryptography and is suitable for CPU-constrained sensor nodes. The second protocol is based on public key cryptography. Both protocols involve communication over a bidirectional radio channel and an unidirectional out-of-band visible light channel. A notable feature of the proposed "public key"-based key deployment protocol is that it is designed to be secure in a very strong attacker model, where an attacker can eavesdrop, jam and modify transmitted messages by adding his own message to both a radio and a visible light channel ; the attacker however cannot disable the visible light communication channel. We show that many existing protocols that rely on the visible light channel are insecure in this strong adversary model. We implemented the proposed protocols on the Meshnetics wireless sensor platform. The proposed protocols are cheap to implement, secure in the very strong attacker model, easy to use and scalable. We also designed and tested a simple random number generator suitable for sensor platforms.

wireless sensor networks; security; key deployment; usability

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