Abstract: “Cloud computing is one of the most emerging technologies in the world providing computing resources as a service on demand via internet maintained by third party service provider. In cloud environment trust is one of the most sensitive and important issue. In order to maintain the privacy of certain user we need strong authentication mechanism. This paper will discuss about the available authentication scheme that have been proposed for cloud environment. This paper will analyze existing authentication scheme in cloud computing from various point of view.”

Keywords: cloud computing,authentication.