基于椭圆曲线加密的多关键词可搜索加密方案

Multiple Keywords Searchable Encryption Scheme Based on Elliptic Curve

针对用户在使用云端数据过程中遇到遍历速度过慢和数据安全性过低的问题,对关键词可搜索加密技术进行改进;将椭圆曲线加密(elliptic curve cryptography,ECC)机制与多关键词可搜索加密方案相结合,在可搜索加密过程中用椭圆曲线对关键词进行编码、加密以及解密处理,同时对关键词进行相关性分数计算,根据分数选择最符合查询要求的文档,使用倒排序索引结构,提高遍历速度;从数据集文件中提取关键词,在虚拟机上进行实验。结果表明,基于ECC的多关键词可搜索加密方案既能减少关键词陷门的生成时间,又能提高检索效率,保证检索文件的高效性以及安全性。

Aiming at the problems of slow traversal speed and low data security encountered by users in the process of using cloud data,the keyword searchable encryption technology was improved.The elliptic curve cryptography(ECC) mechanism was combined with the multiple keywords searchable encryption scheme,and the elliptic curve was used to encode,encrypt and decrypt the keywords in a searchable encryption process.The relevance score for the keywords was calculated,then the documents that best meet the query requirements were choose according to score,and the inverted sort index structure was used to improve the traversal speed.The keywords are extracted from the dataset file and experiments were carried out on the virtual machine.The experimental results show that the searchable encryption scheme based on elliptic curve encryption improves the keyword trapping time and retrieval efficiency,and it indicates that the scheme has the efficiency and security of retrieving files.