Research On Chinese Multi-keyword Fuzzy Rank Searchable Encryption Scheme

Today,cloud computing has become both convenient and economical in terms of data storage and data sharing.Users are interested in outsourcing data to the cloud.Cloud storage is not limited by time,place and device,and releases the user’s local storage burden by uploading data.To protect data from being compromised,often the easiest solution is to encrypt the data before outsourcing.However,the unreadable nature of encrypted data hinders its usability,and searchable encryption is one of the most critical technologies to solve this dilemma.At the same time,as research into searchable encryption continues,issues such as functionality,efficiency,and security and privacy have arisen.currently existing problems:(1)Because of the particularity of Chinese characters,it is relatively complicated to process Chinese keywords,so there are few searchable encryption schemes for Chinese.(2)Existing solutions cannot guarantee higher efficiency when more functions are implemented,and a good balance between functions and efficiency cannot be found.(3)It is impossible to share encrypted data with data users without destroying user privacy,and the data owner cannot take the initiative to control the authority to access encrypted data,and the security and privacy are not high.In response to the above problems,the main research results of this paper include:(1)Propose a Verifiable Chinese Multi-Keyword Fuzzy Rank Searchable Encryption(VCMKFRSE)Scheme.First of all,this scheme constructs a Chinese keyword vector generation algorithm using the Yongzi Ba method and the Unigram natural language processing method,and successfully converts Chinese keywords into keyword vectors;Secondly,an inverse index table is established by using the keyword frequency weight,the weighted area score and the ECC cryptosystem to establish the relationship between the document and the keyword;Next,use the Min Hash function to construct a fuzzy index table,which provides an interface for search operations;Finally,the authentication label table is established by using the authentication label function,and the verification of the search results is realized.The scheme achieves IND-CCA2 security with high efficiency.Finally,the authentication tag table is established by using the authentication tag function,and the verification of the search results is realized.The scheme achieves INDCCA2 security with high efficiency.(2)Chinese Multi-Keyword Fuzzy Rank Searchable Attribute Set Encryption(CMFRSCP-ABE)SchemeIn order to ensure the security of cloud server data and the data privacy of users,we improved the previous scheme and proposed a Chinese multi-keyword fuzzy rank searchable attribute based encryption scheme(CMFRSCP-ABE).We combine Searchable Encryption(SE)technology with Attribute-Based Encryption(ABE)technology to authorize users by adding an access control structure,so that data owners can control the permissions to access encrypted data,improve security and privacy.Our improved scheme achieves IND-CCA2 security under the assumption of DBDH difficulty.