Cloud Based Secure Data Sharing Algorithm for Health Care

Introduction

The Cloud computing generally is a type of computing that relies upon sharing of computing resources rather than having the local servers or personal devices to handle application or services. Cloud computing may be defined as services accessed by means of Internet. The buzzword cloud transforms the way of storing and accessing the data. Unlike traditional applications the cloud applications are web specific in nature. To access cloud applications one needs to have the web supported device. Thus the cloud applications are platform independent and it can be accessed any time anywhere and any place. The ultimate aim of the cloud computing is to give everything as a service to the customers. In cloud computing generally there are three man services, SaaS (Software as a service), PaaS (Platform as a service) and IaaS the Infrastructure as service respectively. And it consists of three main deployment models public cloud, private and Hybrid cloud. In software as service, the software is being stored in cloud servers and it will be being accessed by the client and charges are being paid by the customer as per usage. The customer need not to install the software at the client end. There are several benefits both for client and the vendors. The client need not to have any knowledge of installation, processor speed, and memory in the host system as the service is being retrieved from the cloud servers. Most importantly the client is being charged as per use. In case of vendors, the usage of pirated software is reduced significantly. The Microsoft is planned to offer its software’s everything through cloud. Thus software as a service require minimal amount knowledge to access various services. Whereas the Platform as a service is meant for the developers. It supports the various software development kit and automated testing environment. The infrastructure as a service generally meant for providing the services like hardware and memory support. There are many other services are available including storage as a service e.g. Drop box, security as service, monitoring as service, communication as a service etc. As discussed earlier, the cloud provides every needs of the customers as a service. Coming to deployment models, the public clouds is accessible anyone provided the access credentials and data center nearby the location. The public cloud is considered to be insecure and easily hacked. The private cloud is considered to be highly secure and data can be accessed within the organization environment and maintained by the either the cloud service provider or the local member of organization. The hybrid cloud generally the combination of any two cloud services.

The cloud services are considered to be hit. According to Gartner the revenue of the cloud has been increased gradually. The revenue of cloud computing in 2009 is about 58 billion US dollars where as in 2010 it is nearly 70 billion US dollars. There is 16-17 percent increase in revenue for academic year 2011. The cloud revenue in 2012 is about 111 billion US dollars and in 2013 it’s about 130 US dollars. The cloud revenue is increasing day by day as every domain is started moving to cloud to utilize the characteristics and advantages of cloud. The various advantages include availability, cost, multi tenancy, security, maintainability, auditing etc. The reason behind the adaptation of cloud is its benefits (Figure 1). Unfortunately, its benefits are turned out to be its limitations. The major limitation of cloud is security. And there is tradeoff between the security, privacy and cost. The question arises who is responsible for protecting the data of the users. Though there are many encryption algorithm and better auditing techniques still cloud lack something behind. The cloud is secure but not cent percent. The important thing need to be addressed to improve the security, scalability and energy efficient computing is to make cloud interoperable cloud through federation.

Figure 1.

Revenue of cloud in billions