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\title{Implementing Cloud Data Security by Encryption using Rijndael Algorithm}
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             \author[1]{Sanjoli  Singla}

             \author[2]{Jasmeet  Singh}

             \affil[1]{  RIMT-IET, Mandi Gobindgarh}

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\date{\small \em Received: 15 April 2013 Accepted: 3 May 2013 Published: 15 May 2013}

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\begin{abstract}
        


Cloud computing emerges as a new computing paradigm which aims to provide reliable, customized and QoS guaranteed dynamic computing environments for endusers. However, adopting a cloud computing paradigm may have positive as well as negative effects on the data security of service consumers. In a cloud computing environment, data and the application is controlled by the service provider. This leads to a natural concern about data safety and also its protection from internal as well as external threats. The major issues in cloud computing is the security of data being stored on the provider's cloud and privacy while the data is being transmitted. This paper deals with the methods of providing security by data encryption and to ensure that unauthorized intruder can't access your file or data in cloud.

\end{abstract}


\keywords{authentication, cloud, eap-chap, encryption, rijndael algorithm.}

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\let\tabcellsep& 	 	 		 
\section[{Introduction}]{Introduction}\par
loud computing is the next stage in the Internet's evolution, providing the means through which everything -from computing power to computing infrastructure, applications, business processes to personal collaboration -can be delivered to you as a service wherever and whenever you need. The "cloud" in cloud computing can be defined as the set of hardware, networks, storage, services, and interfaces that combine to deliver aspects of computing as a service as shown in figure  {\ref 1}. \hyperref[b2]{[3]} It is extremely useful for small and medium enterprises to leverage the advantages provided by the cloud. 
\section[{Figure 1 : Cloud Computing}]{Figure 1 : Cloud Computing}\par
Author ? : M.TECH (Computer Science and Engineering), RIMT-IET, Mandi Gobindgarh, Punjab (India). E-mail : sanjoli\textunderscore 11@yahoo.co.in Author ? : Asst. Professor(CSE Department), RIMT-IET, Mandi Gobindgarh, Punjab (India). E-mail : jasmeetgurm@gmail.com\par
The main attributes of cloud computing are illustrated as follows \hyperref[b0]{[1]}:\par
1. Multi-tenancy (shared resources): Cloud computing is based on a business model in which resources are shared (i.e., multiple users use the same resource) at the network level, host level, and application level.\par
2. Massive Scalability: Cloud computing provides the ability to scale to tens of thousands of systems, as well as the ability to massively scale bandwidth and storage space.\par
3. Elasticity: Users can rapidly increase and decrease their computing resources as needed.\par
4. Pay as you used: Users to pay for only the resources they actually use and for only the time they require them. 5. Self-provisioning of resources: Users self-provision resources, such as additional systems (processing capability, software, storage) and network resources. \hyperref[b4]{[5]} a) Security In today's era, cloud computing is the most interesting and enticing technology which is offering the services to its users on demand over the internet. Since Cloud Computing stores the data in the open environment, security has become the main obstacle which is hampering the deployment of Cloud environments. \hyperref[b6]{[7]} In the light of all the advantages of migrating to the cloud, one of the primary disadvantages of the cloud platform is the security aspect. The security concerns fall into two main categories 
\section[{Cloud provider concerns 2. Client based concerns}]{Cloud provider concerns 2. Client based concerns}\par
The cloud provider should ensure that the architecture and the infrastructure are secure and that the data and applications of the client are not compromised.\par
On the other hand, the client should make sure that the provider has taken all measures to secure their data in the cloud.\par
One of the methods to resolve these issues is the encryption of data. Encryption can be done in three ways:- With this option all data is encrypted in storage by the cloud platform itself. Server-side encryption really only protects against a single threat: lost media. It is more a compliance tool than an actual security tool because the cloud administrators have the keys anyway. Server-side encryption offers no protection against cloud administrators. 
\section[{Client/Agent Encryption}]{Client/Agent Encryption}\par
If you don't trust the storage environment your best option is to encrypt the data before sending it up. In it we turn a shared public resource into a private one by encrypting it while retaining the keys. 
\section[{Proxy Encryption}]{Proxy Encryption}\par
One of the best options for business-scale use of object storage, especially public object storage, is an inline or cloud hosted proxy. There are two main topologies:\par
? The proxy resides on your network, and all data access runs through it for encryption and decryption. ? The proxy runs as a virtual appliance in either a public or private cloud. \hyperref[b7]{[8]} II. 
\section[{Problem Definition}]{Problem Definition}\par
While cloud computing greatly facilitating users with storage resources, the greatest challenge or the existing problem comes from the security. The security challenges if not well resolved may the fast growth of cloud Previously security is to data at rest i.e. encryption is done by the cloud service provider at the cloud side. But it leaves the data insecure while user outsources it to the cloud as the data travel in the original form. So we need method that provides security to both data at rest and data while moving.\par
Also some mechanism is required to ensure that the cloud must give access of data only to the authorized user. 
\section[{III.}]{III.} 
\section[{Methodology}]{Methodology}\par
Security of data and trust problem has always been a primary and challenging issue in cloud computing. This section describes a methodology as shown in figure \hyperref[fig_2]{2}    
\section[{Implementation Details}]{Implementation Details}\par
Using Java NetBeans IDE 7.2 and XAMPP 1.7.0, we have implemented methodology which provides better security as secret key is only known to the user and authenticity of user is ensured by Cloud. Service Provider (CSP). 2. CSP checks the authorization using EAP-CHAP and sends the acknowledgement back to the user. 3. User first encrypts his data and then outsources it to the server. 4. When the user downloads his data from CSP, it is received in the encrypted form. 5. To use the data user can decrypt it using same key used for encryption.\par
V. 
\section[{Results}]{Results}\par
The results of the above mentioned system are shown in table 1. and figure \hyperref[fig_4]{5}.   
\section[{Conclusion}]{Conclusion}\par
Although cloud computing has many advantages, there are still many actual problems that need to be solved. The main problem is to maintain the privacy and the confidentiality of the data. Data confidentiality can be achieved by encrypted outsourced content before outsourcing to cloud servers and for privacy it is required that only the authorized user can access the data. Even if some intruder (Unauthorized user) gets access of the data accidentally or intentionally, he will not be able to decrypt it. In my work, I have used Rijndael Encryption algorithm to provide security to the data and EAP-CHAP for authentication purpose.\par
In future the above approach can be enhanced further by including an integrity check mechanism. \begin{figure}[htbp]
\noindent\textbf{}\includegraphics[]{image-2.png}
\caption{\label{fig_0}}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{}\includegraphics[]{image-3.png}
\caption{\label{fig_1}}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{2}\includegraphics[]{image-4.png}
\caption{\label{fig_2}Figure 2 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{4}\includegraphics[]{image-5.png}
\caption{\label{fig_3}BFigure 4 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{5}\includegraphics[]{image-6.png}
\caption{\label{fig_4}Figure 5 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{1} \par 
\begin{longtable}{P{0.4169811320754717\textwidth}P{0.06415094339622641\textwidth}P{0.22452830188679243\textwidth}P{0.07216981132075471\textwidth}P{0.07216981132075471\textwidth}}
\tabcellsep \tabcellsep \multicolumn{2}{l}{File Size(in Bytes)}\tabcellsep \\
\tabcellsep 51\tabcellsep 577\tabcellsep 776\tabcellsep 975\\
Encryption Time(ms)\tabcellsep 16\tabcellsep 32\tabcellsep 47\tabcellsep 51\\
Decryption Time(ms)\tabcellsep 16\tabcellsep 20\tabcellsep 25\tabcellsep 32\\
Delay Time(ms)\tabcellsep 47\tabcellsep 65\tabcellsep 72\tabcellsep 79\end{longtable} \par
 
\caption{\label{tab_0}Table 1 :}\end{figure}
 			\footnote{© 2013 Global Journals Inc. (US) Year} 			\footnote{© 2013 Global Journals Inc. (US) Year} 		 		\backmatter  			  				\begin{bibitemlist}{1}
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\end{document}
