Trusted Resource Allocation in Grid Computing by Using Reputation

Grid system is a dynamic environment where every entity share the resources provided by the other entities. The system enables the coordinated and aggregated use of geographically distributed resources, often owned by autonomous organizations, for solving large-scale problems in science, engineering. However, application composition, resource management and scheduling in these environments is a complex process. The resource provider as well as the user should be convinced before beginning any transaction. Mutual trust must be established between the user and the provider. Trust is built on reputation. The concept of reputation is popular in peer to peer networks. But still it is not perfect in grid computing. This paper presents overview of existing reputation based models for resource selection and propose a new model for resource selection. • Group Oriented Security: Resource sharing is a group oriented activity. A grid security solution must support such capabilities. Grid computing security environments are generally concentrating in properly authenticating users and hosts and in the communications between them. The effective utilization of the facilities of Grid computing requires advanced and secured resource management systems. The wide range of selection and high degree of distributed behavior leads to problem in selection. The degree, in which the resources are trusted, helps in allocation of resources. Reputation can be used as an important metric for trust calculation. The main issues characterizing the reputation systems are the trust metric -how to model and compute the trust and the management of reputation data how to securely and efficiently retrieve the data required for the trust computation. There are some existing models for peer to peer net work systems, distributed systems and also for grid systems. All the models use reputation for determining the trust. These models are reviewed in this paper and the applicability of these models in enhancing the reliability for grid is analyzed. The rest of the paper is organized as follows: Section 2 surveys the previous work in the area of reputation. Section 3 defines trust and reputation and section 4 presents the proposed model with its parameters. Section 5 presents conclusions.