Abstract
With the rapid development of vehicular ad hoc networks (VANETs), security issues are concerned. Among various security measures, secure group key agreement for VANETs attracts more and more attention. Researchers have studied generic group key agreement schemes for a long while; however, most of them are not designed for VANETs. Considering energy-constrained and fast moving features in vehicular ad hoc network, we propose a new location-based distributed group key agreement LDGKA scheme for VANETs. We adopt a hybrid approach in which members in the vehicular ad hoc network form various logic groups in the same region. Within each group, virtual key tree model is employed so that the rekeying operation can be efficiently carried out when members leave or join. It only requires to rebuild [Formula: see text] keys when one node leaves or joins. Moreover, we adopt one-way key derivation to rebuild keys in order to reduce communication overhead of distributing new keys. We also design a protocol for establishing the secure temporary channel dynamically for the nodes that are located in different regions.
Highlights
A vehicular ad hoc network can be regarded as logic groups where the group members are the nodes in the network
The devices in a vehicular ad hoc networks (VANETs) are usually energy constrained and the bandwidth in the network is commonly limited, so a feasible scheme for VANETs must be of low computation with as fewer communication rounds as possible
In order to solve these problems, we propose a new scheme of location-based distributed group key agreement for VANETs
Summary
A vehicular ad hoc network can be regarded as logic groups where the group members are the nodes in the network. In the scheme we adopt a tree structure to reduce the computation when any rekeying operation is performed. This scheme can achieve the goal that given a group, any subset of members can form a private subgroup for secure communication. Members are able to form a new temporary session group if they are initially located in different regions. It does not require any central entity which could be a single point of failure or may cause the performance bottleneck.
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