安全云存储中高效的多关键词查找方案

摘要

To protect users' privacy,data stored in cloud service provider (CSP) usually needs to be encrypted before being sent to CSP. It brings about a problem that how users search files using keywords over encrypted cloud data. In lots of scenarios,CSP is considered as a potential attacker. According to characteristics of cloud computing, we proposed an efficient privacy-preserving approach to support multi-keyword search over encrypted data (short for PPMKS), which is based on binary sort tree for search (short for BSTS). In our PPMKS, authorized users can easily search ci-phertext files using multiple keywords, which can make users enjoy the service of multi-keyword search over encrypted data anywhere and anytime.%用户在租赁了云服务提供商(Cloud Service Provider,CSP)的存储空间之后,为了保护隐私,通常将文件以密文的形式存储在CSP上.这给在密文数据上进行关键词查找带来了问题.在本应用场景中,CSP被视为潜在攻击者.提出了支持多关键词查找的安全高效的云计算方案.该方案基于二叉排序树结构,在保证用户数据的安全和隐私的前提下,支持授权用户对文件的多关键词查询,让用户可以随时随地享受多关键词查询服务.