Research On The Application Of Paillier Homomorphic Encryption In Privacy Protection

With the development of Cloud computing technology and the growing popularity of the Cloud storage application,more and more individual users and enterprise users choose to store the data in the Cloud,for the convenience of storage and management.On the one hand,Cloud services have brought huge economic benefits to people,but on the other hand,it has security risks in the data storage,data computing and user privacy protection.The security problems which affect the application and popularization of Cloud services are urgent be solved.Different from the traditional encryption algorithm,homomorphic encryption can not only realize the requirement of data encryption,but also guarantee to operate on the encrypted data directly,and we can get the same results corresponding to operate on the unencrypted data.Therefore,the application of homomorphic encryption in Cloud services can fundamentally solve the security risks existing in the storage and computing.However,the efficiency of the existing fully homomorphic encryption scheme is low,the traditional encryption algorithm with single homomorphism and Somewhat homomorphic encryption algorithm are relatively mature.In this paper,we do some research on the application of Paillier cryptosystem to realize the confidentiality and privacy protection in cloud environment.The main work includes the following three parts:(1)Aiming at the problem of data integrity in the Cloud services,based on the study of Paillier signature scheme,this paper proposes a digital signature scheme based on Rabin and Paillier,it can effectively solve the contradiction between security and efficiency of existing Paillier signature schemes.(2)For the user privacy protection issues in the Cloud service,this paper presents a group signature scheme based on Paillier cryptosystem,it can effectively resist forgery attacks,and can effectively revoke the signing right of a specified user in the process of signing.This scheme provides the basis for the design of anonymous access control scheme in cloud services.(3)To protect the privacy of the data of the bank stored in the cloud,a scheme is designed in this paper using RSA and Paillier cryptosystem.Without decryption,this scheme can not only realize the sum of the bank customer deposits,but also realize the calculation of bank deposit interest,and can verify the integrity of the ciphertext results returned from Cloud server.In addition,the C++ programming language is used to realize the calculation of interest without decrypting.Therefore,it has a good application prospect in processing the data of bank in cloud environment.