The Application And Research Of Network File Management System Based On Homomorphic Encryption

With the developing of cloud computing,cloud storage is one of the important application modes.Storing data in the cloud make users easy to access data by differents PCs at anytime and anywhere.At the same time,the safety of data is one of the most critical technical problems of the cloud data storage.Nowadays,the classical data encryption technology has already provided good support for cloud security.But in the cloud storage environment,the data which are encrypted by the traditional encrpytion techniques will produce the larger the network and computational costs when in the data searching.For example,when using keyword to search information,the encrypted data need be downloaded into the PC and decrypted.At last,executing keyword searching to judge whether keywords are included in the decrypted data.If considing to search keyword in the cloud storage by using its powerful computing resources to decrypt the data and then get the retrieved result,it will exist the security risks that the clear data exposed in the cloud.The homomorphic encryption technology can let the encrypted data calculate?retrive and analyze without decrypting the data.Therefore,the main work of paper is based on the fully homomorphic encryption technology to research how to apply it into the field of the cloud file management,discuss technical problems need to be solved in the application,explore the optimization performance,build up experimental application environment and provide the necessary technical basis for the application of real situations.Paper's main work includes the following aspects:A:Studying and comparing the principle and character of the traditional encryption technology and the homomorphic encryption technology.The paper analyze the encryption features and theorys?the encryption process and encryption homogeneity of traditional encryption technology.It also analyze the encrypting process encryption homogeneity of fully homomorphic encryption and then contrast the characteristics between them.B:Putting forward a set of file encryption?decryption and retrieval algorithm based on fully homomorphic encryption technology.The paper disscussed the encryption,decryption and retrieval technologied which are executed by bit and improved them on the foundament of algorithm by bit to improve retrieval efficiency.Constructing experimental environment to test the algorithm and get experimental results to judge its effectiveness and correctness.C:Designing and implementing a cloud file management prototype system in C/S mode.The system used the encryption?decryption and retrieval algorithm based on fully homomorphic encryption technology which are proposed in the paper.Implementing the file upload,download,retrieve cloud file management functions.