Research And Practice Of Synchronous Differences In Cloud Storage

Cloud storage provides the function of data storage and business access through a large number of different types of storage devices on the network. Cloud storage system sets up a copy of data on the storage device so that the security of data is ensured. Today, with cloud services technologies emerging, cloud service providers are facing some difficulties on time synchronization delay, bandwidth overhead, supported file types, security of data transmission and offline synchronization ability are different. Most of them are facing the existing time delay, large bandwidth overhead and data transmission safety. Based on the above issues the synchronous process is composed with the client part, web part, synchronous differences part, encryption/decryption part and the cloud part. The scheme proposes an encryption strategy to improve data security while optimizing the differences synchronization algorithms. The cloud storage framework based on the synchronous differences innovates from the following two aspects. By analyzing the characteristic and requirements of an application, we propose an improved differences synchronization algorithm with two steps and make full use of CDC and Rsync algorithm, to reach a quick synchronization purpose, reduce the amount of data transmission and reduce the complexity of the algorithm. We design a dynamic encryption algorithm UDHEA (User Dependent Homomorphic Encryption Algorithm) based on related user information. The client encrypts the user’s secret key as the secret key cipher text using MD5encryption algorithm based on the user’s attribute set by the user and encrypts the data as cipher text using a symmetric encryption algorithm AES. And the clouds can do a simple reconstruction operation for the transmission of data over the cipher text. Then, verify the feasibility, effectiveness and safety of the proposed framework, combined with teachers skydiver system of Changshu Institute Of Technology on the designed framework. Finally, analyze the framework and the related application system performance from a different point of view, do a summary of the full text and put forward on the unsolved problems.