The usage of Cloud Computing users keep their facts onto the third party owners and experience the online demand programs, services and garage from a shared pool of configurable computing resources, without the load of facts garage and protection and costs. The furnished security must guarantee no longer best on authentication but also on files over the cloud for the outsourced records, that is now maintained by way of third parties consisting of cloud carriers. Unluckily, the infrastructure of cloud computing is constructed on internet, and will stumble upon all of the risk of net. To lower the risks, an authentication mechanism is the viable answer. However, conventional alphanumeric password authentication mechanism isn't always relaxed sufficient. A cozy authentication mechanism the use of public-key encryption based totally password have to be proposed in this paper for enhancing traditional authentication mechanism and let users get entry to cloud services securely.