面向6G的区块链物联网数据共享和存储机制

随着区块链技术的发展及应用，区块链技术在提供了不可篡改性、透明性的同时带来的隐私泄露问题也愈加严重. 虽然环签名技术已被广泛应用于区块链隐私保护方案，但现有方案基于公钥基础设施体系，证书管理成本较高. 另外，随着区块链系统国产化的应用需求不断增加，现有的国密算法已不能满足日益复杂的区块链应用需求. 为解决这个问题，提出了一种基于SM9数字签名的常数级大小环签名方案，并在随机谕言机模型下证明了该方案满足不可伪造性和匿名性. 此外，基于该环签名算法，对Hyperledger Fabric联盟链结构进行修改以实现交易方身份隐私保护. 利用Miracl库测试运算耗时，分析了所提方案的计算开销和通信开销. 实验分析结果表明，与现有的方案相比，所提方案在签名生成和验证方面实现了数倍的效率提升. 当环成员数量大于20时，所提方案在签名通信开销上具有明显优势.

6G oriented blockchain based Internet of things data sharing and storage mechanism

With the development and application of blockchain technology, the privacy leakage problem brought by blockchain technology has become increasingly serious while providing immutability and transparency. Although ring signature has been widely used in blockchain privacy protection schemes, existing schemes are based on public key infrastructure system with high certificate management costs. In addition, with the increasing demand for domestic application of blockchain systems, existing national commercial cryptographic algorithms can no longer meet the increasingly complex application requirements of blockchain. To solve these problems, we propose a constant-size ring signature scheme based on SM9 digital signature algorithm and prove its security under the random oracle model. In addition, based on this ring signature algorithm, we modify the consortium blockchain, Hyperledger Fabric, to achieve transaction sender identity privacy protection. We utilize the Miracl library to test the computation time and analyze the computational and communication costs of our approach. The experimental analysis results demonstrate that compared with existing solutions, our approach achieves several times efficiency improvement in signature generation and verification. When the number of ring members exceeds 20, our approach exhibits significant advantages in terms of signature communication costs.