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We address the problem of securing the route discovery for Quality-of- Service (QoS)-aware routing in ad hoc networks. We provide a specification of secure route discovery for QoS-aware routing. We propose a reactive secure routing protocol, SRP-QoS, to defend against adversaries manipulating link and route metrics and, thus, prevent them from influencing the route selection. SRP-QoS ensures the accuracy of the discovered route(s) with respect to generalized link and route metrics. SRP-QoS is generally applicable, as it does not make restrictive assumptions on the network membership and trust, and it provides metrics for the constituent links of the discovered route(s), allowing the implementation of any route selection algorithm. As a result, SRP-QoS can enable QoS-aware routing in a wide range of ad hoc network instances.