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In this paper, to achieve a vehicle user's privacy preservation while improving the key update efficiency of Location Based Services (LBSs) in Vehicular Ad hoc NETworks (VANETs), the authors propose a dynamic privacy-preserving key management scheme called DIKE. Specifically, in the proposed DIKE scheme, they first introduce a privacy-preserving authentication technique that not only provides the vehicle user's anonymous authentication but enables double-registration detection as well. They then present efficient LBS session key update procedures: they divide the session of an LBS into several time slots so that each time slot holds a different session key; when no vehicle user departs from the service session, each joined user can use a one-way hash function to autonomously update the new session key for achieving forward secrecy.
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