中文摘要：

在使用云存储服务的过程中,用户自己的利益可能会受到损害。因为在对云平台数据进行维护和管理时,可能会破坏用户数据的机密性和完整性。解决这个问题的一般方法是加密用户的数据文件,然后搜索特定的关键字来返回用户需要的文件,这样服务器就不能从中得到任何信息。虽然已经有了很多公钥加密搜索的方案,但是大多数的公钥加密搜索方案只支持精确关键字的搜索,当搜索的关键字稍有偏差时,这些方案就会失去作用,这个明显的缺点将严重影响服务器存储搜索的有效性。针对这一问题,文章提出了一种有效的解决方案,这很大程度上增强了搜索系统的可用性。文中也给出了方案相应的安全性证明,能成功抵抗关键字选择攻击。

英文摘要：

In the process of using cloud service, the interests of the users may be damaged. Because when the cloud platform data were maintained and managed, it may maliciously damage the confidentiality and integrity of users＇ data. A general method of solving this problem is to encrypt users＇ data files, and CSP （cloud server provider） search for specific keywords to return the documents to meet the needs of users. The server can＇t get any information from the encrypted documents. Although there have been many public encryption search schemes, most of the public key encryption search programs only support the accurate keyword search. When the input keywords have a little deviation, these schemes will not work. This significant drawback makes existing techniques unsuitable in cloud computing. In this paper, we propose a scheme which solved this problem effectively. This largely enhances the availability of the search system. Our proposed solution also gives the corresponding security proof and it can be successfully against keyword chosen-attack.