Abstract: Cloud computing has emerged as a popular paradigm that offers computing resources as scalable of cloud service provider(CSP) and efforts towards intelligent cloud service selection. Cloud brokers as an additional layer to facilitate cloud service selection and services management task for cloud consumer.Although the issue of data privacy can be solved by database encryption techniques. In outsource database model, the cloud broker sever provider query services to user on behalf of the data owner. The userís data are shared and maintained with it concerns of security vulnerability for all the services. this paper survey on how brokerage system provide authenticated CSPís profile to cloud broker and broker to cloud client.

Keywords: cloud computing, service selection, cloud brokers, database, brokerage system.