Conditional privacy-preserving spectrum trading scheme based on traceable ring signature for DSS system

Due to the scarcity of spectrum and the abuse of idle spectrum, it is very important to share idle spectrum to achieve greater utilization of spectrum. Unfortunately, the existing research hardly considers the security problem and privacy protection of spectrum trading in the dynamic spectrum sharing (DSS) system. Thus, we propose a secure and conditional privacy-preserving blockchain-based spectrum trading scheme in a DSS system. We exploit blockchain and ring signature to build a spectrum sharing system to solve the spectrum access and management issues. In our scheme, primarily, Monero currency is used to trade the spectrum between users for ensuring the fairness of the transaction. Besides, the ring signature on blockchain can realize all legal users’ anonymity during the spectrum trading. Furthermore, we design an ID-based traceable ring signature to achieve conditional anonymity, which can avoid malicious users from disturbing normal transactions. The security analysis shows that our scheme can realize users’ conditional anonymity, unforgeability, and transactions’ traceability. The performance evaluation demonstrates that the computational overhead of our scheme in the signature, verification and tracing process does not exceed \(15\%\) $15\%$ , \(60\%\) $60\%$ and \(90\%\) $90\%$ of that observed in related works, respectively.