Font Size: a A A

Research Ciphertext Queries And Attribute-based Searchable Encryption Scheme

Posted on:2015-03-10Degree:MasterType:Thesis
Country:ChinaCandidate:L L GuoFull Text:PDF
GTID:2268330425487476Subject:Applied Mathematics
Abstract/Summary:PDF Full Text Request
This paper mainly states the retrieval methods of the encrypted information, and it includes the following two parts:The first part researches on the retrieval method of the cloud storage ciphertext. Homomorphic encryption technology can realize the addition and multiplication operations on ciphertext. A new scheme, which is fully homomorphic encryption over the integers, has been obtained through the improvement of Craig Gentry’s symmetric encryption scheme. The scheme has achieved low computing complexity by using elementary modular arithmetic only. On the basis of this scheme, a retrieval method based on ciphertext was designed. It can realize the ciphertext retrieval, which is security and reliable in cloud computing.The content of the second part is about attribute-based searchable encryption scheme. By introducing ciphertext policy attribute-based encryption algorithm into the searchable encryption system, users are able to realize ciphertext retrieval if and only if the attributes satisfy the relevant request. In this part, an attribute-based searchable encryption scheme was constructed, which is mainly used in the retrieval of the encrypted data.In order to improve the efficiency of the scheme, it was modified by introducing searchable symmetric encryption algorithm into the keywords encryption and retrieval phase.The modified scheme not only reduces the computational complexity but also realizes the share of information.
Keywords/Search Tags:homomorphic encryption, ciphertext retrieval, attribute, searchable encryption
PDF Full Text Request
Related items