【作者】 王康乐；

【导师】 董晓蕾；

【作者基本信息】 华东师范大学 ， 软件工程， 2020， 硕士

【摘要】 随着互联网行业的蓬勃发展,用户对数据资源的需求也日益增加。为了满足用户的需求,云计算应运而生。在如今互联互通的时代,云存储已经成为云计算中最热门的应用之一,用户也越来越倾向于把重要的和隐私的信息存储到云服务器中。其中一个最普遍使用的方法就是在上传到云服务器之前把数据信息进行加密处理,但是在云服务器中搜索到需要的数据信息也变成了一个障碍,为了消除这一障碍,可搜索加密技术便随之而出,可以帮助用户实现搜索的目的。因此,本文基于对称可搜索加密方案进行了研究与改进,具体研究成果包括:针对云服务器作为第三方不可信的问题,本文基于一个有效的对称可搜索加密方案设计了一种可验证的方法,以便对云服务器返回的搜索结果进行正确性的检验,即可验证的对称可搜索加密方案(简称VSSE方案)。该方案通过使用消息认证码(MAC)技术达到了可验证性目的。此外,本文对VSSE方案进行了延伸,以满足用户在搜索过程中的特殊需求。最后,通过安全性分析和性能评估测试,展示了方案是安全的和有效的。针对用户在搜索过程中可能出现拼写不正确或者格式不一致等客观因素导致的问题,本文基于一个可搜索加密方案构造了一个支持模糊搜索且可验证可排序的可搜索加密方案(简称VRFSE方案)。该方案利用编辑距离技术实现了模糊搜索功能,同时,云服务器可以把与用户搜索的关键词最相关的前k个文件返回给用户,以达到用户搜索的真实目的。另外,本文对此方案进行了正确性、安全性与效率分析,表明方案是安全和有效的。更多还原

【Abstract】 With the vigorous development of the Internet industry,users’ demand for data resources is also increasing.In order to meet the needs of users,cloud computing came into being.In the era of interconnection,cloud storage is already one of the hottest applications in cloud computing,and users are increasingly inclined to store important and private information in cloud servers.One of the most commonly used methods is to encrypt the data information before uploading it to the cloud server.However,searching for the required data information in the cloud server has also become an obstacle.In order to eliminate this obstacle,search encryption technology comes along,it can help users achieve their search goals.Therefore,this paper researches and improves based on symmetric searchable encryption scheme.The specific research achievements include:Aiming at the problem that the cloud server is not trusted as a third party,this article designs a verifiable method based on an effective symmetric searchable encryption scheme,in order to verify the correctness of the search results returned by the cloud server,which is verifiable symmetry Searchable encryption scheme(referred to as VSSE scheme).This scheme achieves the verifiability by using the message authentication code(MAC)technology.In addition,this article extends the VSSE scheme to meet the special needs of users in the search process.Finally,through security analysis and performance evaluation tests,the scheme is shown to be safe and effective.Aiming at the problems caused by objective factors such as incorrect spelling or inconsistent format during the search process,this paper constructs a searchable encryption scheme that supports fuzzy search,verifiable and ranked based on a searchable encryption scheme(called as VRFSE scheme).VRFSE scheme utilizes the edit distance technology to implement the fuzzy search function.At the same time,the cloud server can return to the user the top-k files that are most relevant to the user’s search keywords,so as to achieve the real purpose of the user search.In addition,this article analyzes the correctness,safety,and efficiency of this scheme,the scheme is shown to be safe and effective.更多还原