Many challenging issues such as concealment, security, and availability occur by highly\ dynamic, distributed, and non\ transparent nature of process. Trust direction is a standout amongst the most difficult issue for the day to day life and growth of cloud computing. Deliverance customer or consumer privacy is not an easy task due to the confidential information involved in the interactions between customers and the confidence management inspection and repair. Protecting cloud service against their malicious client (e.g. such clients may give misleading feedback to specific cloud service for improving publicity of cloud) is a complicated issue. Dynamic nature of cloud environment, the availability of the cartel management service is a challenging issue for assuring. In this paper, we elaborate the purpose as well as effectuation of Cloud Armor, a reputation based trust management rrangement which provide an arrangement of different functionality to deliver Trust as a service (TaaS), including i) a novel convention to demonstrate the believability of trust inputs of customer or user as well as save security of clients, II ) Not only a versatile but also robust believability modelling for measurement the credibility of trust feedback to keep cloud avail from malicious clients and to analyze the dependability of cloud armed service , and iii) an availability model to great deal with the accessibility of the decentralized usage of the trust management service. The achievability and advantages of our methodology have been tried by a model and test studies utilizing a collection of true trust feedbacks on cloud services.

Keywords : Cloud computing, trust management, reputation, credibility, credentials, security, privacy, availability.