Abstract
Cloud computing is a technology that creates a virtual environment by configuring various computing devices. It provides software, platform as well as infrastructure as a service. Most companies have shifting or have included online operations mode along with offline mode of operation to expand business. Organizations are using cloud services to save on infrastructure and other associative costs. Most cloud services are chargeable on the basic of usage. Authentication is an important aspect of cloud computing. Various authentication algorithms which are presently in use are having some limitations. This chapter reviews various existing authentication and authorization mechanisms used for the cloud environment and will discuss how the blockchain technology with its features like transparency, immutability, traceability can be used to provide authentication in cloud environment.
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