Review on various authentication scheme over cloud computing

Cloud computing is basically excogitated from the word internet, which is an advance technology. Cloud computing enables us to access services and infrastructure over the cloud through internet and also permits secure sharing of resources. The use of computing resources as a service with the help of internet is called Cloud Computing. It has started to gain vision in corporate data centers. In recent years, cloud computing is including grid computing because utilization of virtualization at data center could increase. With increase in the number of user and data, there is a need of data confidentiality as well as authenticity of users connected to the cloud so as to protect them from each other as well as from the hackers too.