Verifiable Ciphertext Retriveal Research Of Results Diversity Ranking

In the information age,mass data is generated every moment.Cloud storage gradually becomes the mainstream,because it has some important features,including large memory,convenience and low service fee,etc.But the cloud server is honest-but-curious.The security of data is not guaranteed.Driven by the growing security demands of cloud storage,sensitive data have to be encrypted before uploading.However,it is difficult to manage these data.Traditional plaintext retrieval methods cannot be used.Ciphertext retrieval is proposed to allow users to search over encrypted data.But,most ciphertext retrieval schemes not consider search result diversification,resulting in information redundancy.Moreover,users will cost much time and many resources to filter the real interesting ones among a large quantity of returned files.Besides,the cloud server may return false results in order to save its computation cost or because of the attacks from hackers.So it is very necessary to provide users with a verifiable mechanism to assure the correctness and the completeness of search results.1)In order to solve the problem of redundant retrieval results,this paper proposes a variety ranking scheme based on ciphertext.This scheme creates an index using the bloom filter and uses the diversity algorithm to sort document data,which effectively solves the diversity sorting retrieval of ciphertext data.Users have a better experience.2)When the user retrievals data from the cloud server,the cloud server may return the wrong result due to an attack.So,this paper designs the result verifiable mechanism on the basis of diversified ciphertext retrieval.The user can verify that the return result contains keywords,integrity,tampering,and sorting.If validation does not pass,the user can be rejected.3)Based on the results of ciphertext,a variety of ciphertext retrieval system was designed and implemented.The main functions of the system are the encryption and decryption of the documents,the establishment of index,the establishment of the trap door and the diversity retrieval.Finally,under the real data sets,this paper carries out the simulation experiment based on the diversified sort of verifiable ciphertext retrieval method,and the result of the experiment are analyzed,including security analysis and performance analysis.