To solve the security issues of network features and data sharing features in cloud storage service, this paper proposes a data security access scheme in cloud storage Based on Attribute-Group. In terms of access rights control and access control architecture for the access control mechanism research, in this scheme, data owners do not participate in the specific operation of the property and user rights, re-encryption on the NameNode, can reduce the cost of the computation and management of the client, and also reduce the complexity of rights management and property management.

No abstract

Simulation and modeling are useful tools in prototyping advances in many areas of technology. The performance of modern processors advances much faster than that of storage components making disk systems prime candidates for simulation. Simulating disk systems allows researchers to determine and quantify the performance impact of alternative file system designs and disk data rearrangement techniques. This paper describes a System Assisted disk I/O Simulation Technique (SAST). This technique uses a real system to estimate disk request service times, relieving the researcher from the burden of modeling the target system. The system accepts disk trace data as input, and accurately predicts disk service times. In addition, we describe a disk trace collection technique capable of collecting accurate trace data from the Windows 95 operating system.

Abstract. Data of multi-tenant is stored together in cloud computing, in order to ensure the data security of tenants that we must to isolate the application and data of each tenant, the security of all tenants may be affected and even cause the whole system to be broken down if the scheme of data isolate is failure, therefore it is worthy to research and analysis the solution of data isolation of multitenant in cloud computing environment, in this paper, we research and analyze the solution for application and data isolation of multi-tenant in cloud computing thoroughly, finally we given a related application scenario.

No abstract