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With the widespread popularity and usage of Internet-enabled devices, Internet of things has become one of the most popular techniques of the modern era. However, data generated from various smart devices in IoT environment is one of the biggest concerns. To process such a large database repository generated from different types of devices in IoT environment, Cloud Computing (CC) has emerged as a key technology. But, the private information from IoT devices is stored in distributed private cloud server so that only legitimate users are allowed to access the sensitive information from the cloud server. Keeping focus on all these points, this article first shows security vulnerabilities of the multi-server cloud environment of the protocols proposed by Xue et al. and Chuang et al. Then, we propose an architecture which is applicable for distributed cloud environment and based on it, an authentication protocol using …