Opportunistic Network Selfish Node Detection Algorithm Based on Credibility Combining Energy and Cache

The existing selfish node detection algorithms for opportunistic networks do not consider the impact of node energy and cache on node selfishness, resulting in inaccuracies and high latency in the detection algorithm. Therefore, this paper proposes a selfish node detection algorithm based on credibility combined with energy and cache (CDEC). Firstly, a new credibility model is presented. Then, through an analysis of the residual energy and cache usage ratio of nodes over time, selfish nodes have greater differences compared to cooperative nodes. Finally, the overall service quality of nodes is combined with their credibility, residual energy, and cache usage ratio to detect selfish nodes based on their service quality. Simulation results show that compared with existing Watchdog and 2-ACK detection algorithms, the CDEC algorithm can effectively improve the accuracy of selfish node detection and message delivery rates while reducing network latency.