Along with low ownership costs and flexibility, users requirethe protection of their data and confidentiality guaranteesthrough encryption. They allow the storageserver check a user data ownership, based on a static and short value (e.g. These schemes are called Identity based authentication. For example, a user maycheck whether another user has already uploaded a file, bytrying to outsource the same file to the cloud.Recently, to mitigate these concerns, many efforts have been proposed under different security models(, ,).
For instance, several attacks target eitherthe bandwidth consumption or the confidentiality and theprivacy of legitimate cloud users. Client data deduplication brings many security issues,considerably due to the multi- owner data possessionchallenges. Despite thesenamely Dropbox, wuala and Memopal, apply client sidededuplication (, ). This concept avoids the storageof redundant data in cloud servers and reduces networkbandwidth consumption associated to transmitting the same contents several times. As such, the use of remote storage systems is gaining an expanding interest, namely the cloud storage based services, since it provides cost efficient architectures.For saving resources consumption in both networkbandwidth and storage capacities, many cloud services,namely Dropbox, wuala and Memopal, apply client sidededuplication (, ). Source deduplication has become a mainstay of cloud backup that saves network bandwidth and reduces storage space.Nowadays, the explosive growth of digital contentscontinues to rise the demand for new storage and networkcapacities, along with an increasing need for more costeffectiveuse of storage and network bandwidth for datatransfer. Storage system is illustrated.The market for cloud backup services in the personal computing environment is growing due to large volumes of valuable personal and corporate data being stored on desktops, laptops and smart phones. The operation mechanism including ecology chain, game theory, ant colony optimization, data life cycle management, maintenance and update, convergence and evolution mechanisms are analyzed too. The proposed architecture of cloud storage is layered and cooperative, and the discussed key technologies involveĭeployment, storage virtualization, data organization, migration, security, etc. Cloud storage is a novel storage service mode which the service providers supply storage capacities and data storage services through the Internet to the clients meanwhile, the clients needn't know the details and loweredstructures and mechanisms. This paper proposes a general architecture of cloud storage system, analyzes the functions of the components, and discusses the key technologies, etc. Keywords Cloud Storage, Data Security, Advanced Encryption Standard(AES), Deduplication, Confidentiality, Proof of Ownership. To perform deduplication at block-levelraises an issue with respect to key management, in order to implement the keymanagement for each block together with the actual deduplicationoperation. Although based on data encryption scheme, DDCloud remains securewith an additional encryption operation and an access control mechanism with higher authority privilege. We propose a system service which assures block-level deduplication and data condentiality at the same time. To better protect data security, this paper makes the first attempt to formally address the problem of authorized data deduplication. To protect the confidentiality of sensitive data while supporting deduplication, the convergent encryption technique has been proposed to encrypt the data before outsourcing. Deduplication reduces the space and bandwidth requirements of data storage services, and is most effective when applied across multiple users, a common practice by cloud storage offerings. Cloud storage services commonly use deduplication,which eliminates redundant data by storing only a single copy ofeach file or block. Security and privacy are the major concerns for the public cloud environments. Cloud computing has accelerated with the wide use of cloud-based services for large scale content storage,processing, and distribution. Of CSE SVIT, Rajankunte Bangalore-IndiaĪbstract -Cloud computing has received a lot of popularity in the last few years and market observers believe it to be the future, but not if security problems persist. Of CSE SVIT,Rajankunte Bangalore-Indiaĭr. DDCloud: A Data Deduplication for Storage System in a Dynamic Cloud
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