INTERNATIONAL JOURNAL OF SCIENTIFIC & TECHNOLOGY RESEARCH VOLUME 9, ISSUE 02, FEBRUARY 2020 ISSN 2277-8616 1964 IJSTR©2020 www.ijstr.org Trust Evaluation Models For Cloud Computing Vijay Kumar Damera, A Nagesh, M Nagaratna Abstract: There is a big race for processing technology and storage and resource sharing capacity on interconnected servers around the world. This race defines what we call ―Cloud Computing‖. In recent years, cloud computing has developed rapidly in the context of the ris e of the global Internet, and more and more services and products based on cloud computing have become more and more. As an emerging information service model, cloud computing has brought about tremendous and profound changes for computing services in the Internet era. However, due to the dynamic and complex nature of the cloud environment, users are faced with various data security and personal privacy risks when using cloud services. These problems have become an important factor hindering the development of cloud computing. In this context, Trust plays a crucial role in cloud environment to offer reliable services to the cloud customers. It is the main reason for the popularity of services among the cloud consumers. To achieve this, trust should be established between cloud service provider and cloud consumer. In this paper, An attempt is made to present different trust evaluation models proposed in the literature for cloud computing environment. Index Terms: Trust, Trust Model, Cloud Computing,Security and Reputation. ———————————————————— 1 INTRODUCTION Digital transformation already reached the entire market, regardless of whether the business is digital or not and more than anything,this transformation aims to use technology for the benefit of people, employees and consumers. Consumers are increasingly connected and expect organizations to be part of this world as well - not just through marketing, but throughout the journey. The best consumer experience is through digital processes. Organizations looking to move fast, preserve flexibility and keep data safe have chosen the cloud[1,2]. When As a product of the convergence of computer technology and communication technology, the Internet is evolving from a traditional computer communication platform to a ubiquitous distributed network computing platform. In the past, people tried to make computers have networking capabilities, but now they emphasize the network's computing power[3,4]. Especially with the wide deployment and application of various mobile personal computing PCs (Personal Computing) devices, the Internet has become an indispensable tool and carrier for people's lives and work. People put more personal information with privacy and security requirements on the Internet for storage or processing, such as public mail systems and various social networking platforms (Facebook, intranet, etc.); originally served by a single organization, government or scientific research institution. Application systems are rapidly transforming into open systems for the Internet. E-commerce, e-government, and e-science have emerged to better handle and share services[5,6]. New generation information technology and service-oriented system frameworks such as cloud computing provide opportunities for enterprises to improve production and operation efficiency, integrate resources and synergistic value innovation from a wider scope, and establish more efficient and low-carbon operation systems and service models. However, the new cloud service model has also brought new security risks in the process of re-integrating the industrial chain and the collaborative value chain. The virtualized remote service model and multi-agent collaborative service features have continuously broadened the traditional information security boundary, bringing more security risks[8,9]. Traditional information security technology can't solve this problem very well, and the trust-based system management method provides a new idea. The trust model can help enterprise users to effectively identify the credibility of cloud service resources, so that enterprise users can choose the appropriate service resources to deploy their tasks in accordance with the needs of their own business processes. On the basis of low cost and high efficiency of cloud services, the security and credibility of services are guaranteed, which provides an important guarantee for enterprises to improve production efficiency and gain competitiveness under the wave of new generation information technology. Trustworthiness, as a basic requirement of Internet-based application systems, faces many new challenges in new computing environments and application models. How to effectively manage trust in the Internet environment to adapt to the needs of the development of computing environment and application mode has become a hot issue[10]. Under the background of a variety of trust problems in Cloud Computing environment, in this paper, An attempt is made to present different trust evaluation models proposed in the literature for cloud computing environment[11,12]. 2 INTRODUCTION TO CLOUD COMPUTING Cloud computing is a generic term applied to anything that involves obtaining services hosted on the Internet. We can ask this interesting question: why not implement Internet services or resources under a scheme similar to the payment for drinking water service, or for renting an apartment, where the provider provides what is required and the user only pays for the use that makes? If this happens, the user would not have to worry about acquiring computer equipment and its respective maintenance, updating the applications or operating system, as it would be the responsibility of the supplier. This will lead the company to optimize costs and improve its productivity[2,3,4]. It is for this reason that organizations are turning their attention to this technology known as cloud computing, which is capable of minimizing the time spent in activities of lower value and allowing staff working in technology areas of information, focus your ———————————————— • Vijay Kumar Damera is currently pursuing PhD degree program in Computer Science and Enineering in JNTU Hyderabad, Telangana, INDIA, E-mail: dameravijaykumar@mail.com • Dr. A. NAgesh is currently working as professor in Dept. Of CSE, MGIT, Hyderabad, Telangana, INDIA. E-mail: akknagesh@rediffmail.com • Dr. M. Nagaratna is currently working as professor in Dept. Of CSE, JNTUCEH, Hyderabad, Telangana, INDIA. E-mail: mratnajntu@gmail.com