Research on Spectrum Sensing Security Strategy Based on Game Theory and Blockchain for Wireless Communications

With the scarcity of spectrum resources has led to various complex attack threats faced by secondary users (SU) when using idle spectrum in authorized networks. This paper addresses the security challenges faced by secondary users (SU) in wireless networks due to attacks like jamming, eavesdropping, and primary user emulation attacks (PUEA). A game theory and blockchain-based security strategy is proposed, using smart contracts to enhance SU's defense capabilities in a complex network of multiple users and jamming nodes. An attack-defense model is developed to mitigate PUEA attacks, with blockchain technology optimizing network coordination and reducing interference. Additionally, an improved PoW consensus mechanism and energy harvesting (EH) technology are used to enhance security and efficiency. Simulation results show a 15% improvement in SU detection probability and a 72% increase in secrecy capacity, outperforming existing algorithms.