Abstract—No examples of public clouds. Hybrid Cloud: Hybrid

Abstract—Nodoubt that the Cloud computing technology are gaining theubiquitous adaptation due to the countless features they provide. Although, thesecurity & privacy problems are the main considerable encumbrance holdingback the universal adoption of this new emerging technology. The main obstacleor hindrance of the cloud adaptation among the small or big enterprises is the privacy as well as the security oftheir data. In this paper we have mainly focused at the service providers sideby suggested the various cipher encryption algorithms. So as to make the cloudtrusty and offer the desired security features to the cloud user’s.

   Keywords– Security, Encryption Algorithms, RSA, AES, DSA, Blowfish.____________________________________    I. Introduction:Cloud computingproposes a new way of computing. It provides the development of environment andthe allocation as well as the reallocation of computer resources as per thedemand.

Virtually it satisfies the on demand needs of the user and facilitatesthe resources “as a service model”. The cloud technology offers are we can sayit another words that it provides the ability for both small as well as the bigorganizations to move/shift their data globally. It is a of using the remoteservices through a network. Cloud computing allows its users to use maximumnumber of resources through minimum resources available at the user’s end. Thecloud computing environment facilitates the way to use the computing resourcesthrough a device that is capable of connect the user to the server at any locationacross the world and also the users are not bounded to store the data at theirend because the data is stored on the server.

Cloudconcept reduces the cost of hardware at the user end. Users are not bounded tostore their data at the user’s end because the data is stored on the cloud.Through the Cloud users can access their data through any location. TYPES OFCLOUDSThe environment of cloudcomputing is divided into three different categories as per their usage andrequirement include, private cloud, public cloud and hybrid cloud. Private cloud:  Private clouds are owned by the single organization.  The private cloud provides better control and more flexibility.

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They are very expensive and secure when we compare them to other clouds. The providers and the users have a very good control of the cloud infrastructure. One of the best examples of a private cloud is Eucalyptus Systems 8.   Public Cloud:  They are totally hosted and maintained and are shared on a larger scale. Consumers pay for the resources that they use. Users have a little control over the cloud infrastructure. Microsoft Azure, Google App Engine are the examples of public clouds.

Hybrid Cloud: Hybrid clouds is the composition of two or more cloud models, linked each other in a way so that the data transfer takes place between them without affecting each other. These types of clouds are created by the large enterprise. In this model, the company outlines the main goals and requirements of services 9.  But the major drawback of the hybrid cloud is the difficulty in effectively creating and governing such a solution. ·     Community Cloud: This typeof cloud is basically managed by group of originations that have a commonobjective to achieve.

The members share access to the data in the cloud.