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A Security Association (SA), established by strong authentication, between a node pair in a Mobile Ad hoc NETwork (MANET) could be lost when its route is disconnected. In contrast, in good channel conditions and stable topology, routing protocols such as the Optimized Link State Routing (OLSR) do not refresh routes periodically, and in doing so, a SA bound to these routes could become stale and out of date. In this paper, the authors demonstrate a decoupling of the maintenance of the SAs from the link state conditions by introducing a timer that defines the lifetime of the SAs, as well as the periodicity of strong authentications. This timer is implemented within a state machine that also manages other aspects of the authentication process.
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