Design And Implementation Of File Security Storage And Management System Based On Cloud Platform

In recent years,with the development of cloud computing and big data technology,cloud storage server is widely used in people's daily life,many users often upload massive data to cloud storage server for saving operation cost.Although cloud storage server provides users with authentication services,it can not meet the requirements of users for secure storage.Encryption technology is a method to ensure the safe transmission and storage of data.However,because of cloud supercomputing capability,the traditional cryptographic algorithm has shortcomings,so the cryptographic algorithm for cloud computing characteristics is a problem worthy of study,which is of great significance to improve the security of cloud storage data.This paper studies the technology of cloud file security transmission,storage and sharing.Firstly,in this paper,a variety of stream cipher algorithms using a variety of methods and technologies is proposed,secondly,the effect of these algorithms on digital image encryption by simulation is studied.Finally,a variety of stream cipher encryption algorithms,including innovative algorithms,is applied to the cloud file security storage technology,and designed a B/S architecture system for cloud storage and file management,which is convenient for users to operate in the computer terminal,and can realize the sharing of cloud storage files safely and conveniently,the new point of this paper includes:(1)The chaos of a class of time-varying generalized sign system is proved theoretically.Combined with the nonlinear shift register,the simulation method is used to detect the classical random performance of the generated chaotic sequence.The results show that the generated sequence has good random performance,so it is reasonable to use them to design the key stream sequence.(2)The 16-order latin square nonlinear transformation group and its algebraic expression were constructed.At present,according to the new model of perfect security system,high-order latin square can design more abundant cipher algorithm,but the existing research is less.Therefore,combined with breadth first traversal algorithm,a new stream cipher algorithm is designed by using 16-order latin square,and its encryption effect in image encryption is verified by simulation.Compared with the common algorithm,the new algorithm has better encryption effect in correlation coefficient,information entropy,signal-to-noise ratio and other performance indicators.(3)The cloud file security transmission and storage system developed by using the B/S architecture and the flask framework in python,The file encryption upload module and file download decryption module are designed by using the new encryption algorithm and the existing multiple encryption algorithms,which can ensure the security of cloud file transmission and storage.The system also has the following features: the designed multi-user registration and login module can improve the security and convenience of the system;the added initial key box input module and sharing module solve the problem that the existing initial key box was not designed and can not be freely shared;the preliminary solution to the free sharing of files was proposed and the implementation effect is shown;based on RSA algorithm,the method of initial key management is beneficial to the secure sharing of multiuser files.