Hyperledger Fabric中基于层级结构的公钥广播加密方案  

Hierarchical structure-based public key broadcast encryption scheme in Hyperledger Fabric

作　　者：黄宗敏 张大伟[1] Huang Zongmin;Zhang Dawei(School of Computer&Information Technology,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学计算机与信息技术学院,北京100044

出　　处：《计算机应用研究》2021年第5期1302-1308,1313,共8页Application Research of Computers

摘　　要：针对Hyperledger Fabric联盟链的公开账本上的安全群组通信问题,基于Fabric通道中成员管理的层级结构,提出使用子集覆盖框架下的CS方法和IBE算法相结合的方式构造出适用于联盟链的公钥广播加密方案。该方案改进了CS方法原有的完全二叉树结构,依据Fabric通道内部的组织结构建立了具有层级结构的二叉树;采用类哈夫曼编码方式唯一标志各节点在二叉树中的位置以提高查询速度;引入预留节点和弃用节点,设计了相应的二叉树更新算法以实现成员的动态加入和退出。分析和测试结果表明,该方案为联盟链系统提供了一种高效、安全、细粒度的数据隐私保护方案。In order to solve the problem of secure group communication on the public ledger of Hyperledger Fabric,based on the hierarchical structure of membership management in the Fabric channel,the paper proposed a public key broadcast encryption scheme for the consortium blockchain by combining the CS method under the subset-cover framework and the IBE algorithm.This scheme improved the complete binary tree structure of the CS method,and constructed a binary tree with hierarchical structure according to the organizational structure in the Fabric channel.This scheme adopted a Huffman-like coding me-thod to uniquely identify the position of each node in the binary tree so as to improve the query speed.The scheme introduced the reserved node and the deprecated node,and designed the corresponding binary tree update algorithm to implement the dynamic joining and exiting of members.The analysis and experiment show that this scheme provides an efficient,secure and fine-grained data privacy protection scheme for the consortium blockchain.

关 键 词：广播加密 Hyperledger Fabric CS方法 IBE 数据隐私保护 

分 类 号：TP391.1[自动化与计算机技术—计算机应用技术]