区块链技术下移动用户位置隐私可搜索加密  

Searchable Encryption of Mobile User Location Privacy in Blockchain Technology

作　　者：任瑞仙 吕巾娇[2] REN Rui-xian;LV Jin-jiao(Department of Big Data and Intelligent Engineering,Shanxi Institute of Technology,Yangquan Shanxi 045000,China;Beijing Normal University,Beijing 100091,China)

机构地区：[1]山西工程技术学院大数据与智能工程系,山西阳泉045000 [2]北京师范大学,北京100091

出　　处：《计算机仿真》2024年第8期418-422,共5页Computer Simulation

基　　金：山西省教育科学“十四五”规划课题(GH-220825)。

摘　　要：位置隐私加密是为了防止用户的历史位置以及现在的位置被不法分子在未经用户允许的情况下获取,导致用户隐私泄露,造成用户的财产损失。为此,提出一种基于区块链的移动用户位置隐私可搜索加密方法。通过转换用户的位置信息形成用户模型,构建带有用户位置信息的查询矩阵,通过矩阵加密移动用户位置,隐藏用户位置信息。将加密后的移动用户位置信息上传至区块链,引入B+树索引提升区块链密文交易搜索速度,采用加权统计算法完成移动用户位置隐私可搜索加密。实验结果表明,所提方法有效加强了移动用户位置隐私保护能力,且可搜索加密可信度值接近1,提升了加密数据查询的实用性。Location privacy encryption is aimed at preventing unauthorized parties from accessing users'historical and current locations.In order to address the limitations of searchable encryption for mobile user location privacy,a blockchain-based method was proposed.This method transformed the user's location information into a user model and constructed a query matrix with location information.And then,the matrix was used to encrypt and hide the user's location information.Meanwhile,the encrypted location data was uploaded to the blockchain.Moreover,a B+tree index was introduced to enhance the search speed of encrypted transactions.Finally,the weighted statistical algorithms were employed to achieve the searchable encryption.Experimental results demonstrate that the proposed method effectively strengthens the protection of mobile user location privacy and improves the practicality of encrypted data retrieval.And the credibility of searchable encryption is close to 1.

关 键 词：区块链 移动用户 位置隐私 可搜索加密 树索引 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]