  This paper studies the problem of robust spectrum-aware routing in a
multi-hop, multi-channel Cognitive Radio Network (CRN) with the presence of
malicious nodes in the secondary network. The proposed routing scheme models
the interaction among the Secondary Users (SUs) as a stochastic game. By
allowing the backward propagation of the path utility information from the
next-hop nodes, the stochastic routing game is decomposed into a series of
stage games. The best-response policies are learned through the process of
smooth fictitious play, which is guaranteed to converge without flooding of the
information about the local utilities and behaviors. To address the problem of
mixed insider attacks with both routing-toward-primary and sink-hole attacks,
the trustworthiness of the neighbor nodes is evaluated through a multi-arm
bandit process for each SU. The simulation results show that the proposed
routing algorithm is able to enforce the cooperation of the malicious SUs and
reduce the negative impact of the attacks on the routing selection process.
