关键词: 无线自组网, 文件共享, 信任评估, 风险评估

Abstract: For the security of wireless Ad hoc networks, a new trust model is proposed in this paper. Due to the introduction of risk element, the model becomes more sensitive to malicious behaviors and more immune to the sudden changes of nodes’ behaviors. Meanwhile, as a result of direct trust computation with weights assigned to files, it is effective to prevent malicious behaviors implemented through the accumulation of reputation. Subsequent experiments show that, compared to wireless Ad hoc networks without trust model, the proposed model can identify malicious nodes effectively and reduce the number of bad transactions notably.

Key words: wireless Ad hoc networks, file-sharing, trust evaluation, risk evaluation