Research Oin Privacy Cryptographic Data Retrieval Algorithm For Cloud Storage

Today,cloud computing technology is evolving very quickly,allowing users to transfer private data from the local to the cloud server.The files or data uploaded by the user to the server are processed in a series of processes in the cloud and converted into cipher text data for secure storage.However,after the data is encrypted,the user will inevitably encounter difficulties in searching for ciphertext data.Therefore,in the cloud storage environment,it is necessary to research and design a retrieval algorithm for encrypted ciphertext data.Aiming at the problem of secure and efficient search of ciphertext data in cloud environment,this thesis first proposes a hash index structure that can be efficiently retrieved,and designs a method for constructing a keyword semantic relation library,and then further proposes a method to effectively protect user privacy data.The encryption algorithm finally describes and implements a cloud storage system that ensures search security.The main research work of this thesis is as follows:(1)A hash index structure that can efficiently search in parallel is proposed.According to the characteristics of cloud storage environment data storage,based on the existing inverted index structure,Hadoop and Lucene are combined to perform multi-key mapping on index files and build index tables and record tables.The experiment has verified the strong retrieval efficiency.(2)The construction method of keyword semantic relation library is proposed.For the various keywords provided by the user,the association rule is used to mine the Apriori algorithm to expand the keyword to obtain the keyword set,and the retrieved file containing multiple keywords in the extended set is subjected to comprehensive correlation calculation of the extended query to establish Semantic relationship library.The experimental results show that the retrieval efficiency is usually positively correlated with the number of keywords.(3)A specific privacy ciphertext data search algorithm is proposed.Aiming at the problem that the general public key cryptosystem is not efficient in encryption search,this thesis optimizes the attribute-based dual-strategy ABE encryption algorithm and improves the key mechanism appropriately.The specific ciphertext retrieval algorithm is given.The experimental results verify that the algorithm achieves good security.