Security in multi cloud data storage with sic

IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 03 Issue: 02 | Feb-2014, Available @ http://www.ijret.org 81
SECURITY IN MULTI-CLOUD DATA STORAGE WITH SIC
ARCHITECTURE
Kalyani.M.Borse1
, Ankita.G.Deshpande2
, Ashlesha.A.Deshpande3
, Ms.Juily.S.Hardas4
1, 2, 3, 4
Student, Computer Engineering Department, GES R.H.S.COE, Maharashtra, India
Abstract
Cloud computing is becoming an important thing to deal with, in many organizations around the world. It provides many benefits like
1. cost, 2.Reliability and 3.Ease in retrieval of data. Security in cloud computing is gaining more and more importance as
organizations often store sensitive data and important data on the cloud. Security of data in cloud is an issue which should be focused
carefully. Customers do not want to lose their sensitive data due to malicious insiders and hackers in the cloud. In addition, the loss
of service availability has caused many problems for a large number of recently. Data intrusion technique create many problems for
the users of cloud computing. The other issues such as data theft, data lost should be overcome to provide better services to the
customers. It is observed that the research into the use of intercloud providers to maintain security has received less attention from the
research community than has the use of single clouds. Multi-cloud environment has ability to reduce the security risks as well as it
can ensure the security and reliability. The system aim to provide a framework to deploy a secure cloud database that will guarantee
to avoid security risks facing the cloud computing community This paper suggests new architecture for cloud environment which will
help in reducing the security threats. The efficient and secure use of cloud computing will provide many benefit to the organizations in
terms of money and ease in access to the data.
Keywords: Cloud computing, single cloud, multi-clouds, cloud Storage, data integrity, data intrusion, service
availability, Performance, cost-reduction.
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1. INTRODUCTION
Cloud Computing is a technology that uses the internet and
remotely located servers to store the data of the users and for
running the application programs. Cloud computing allows
business organizations to use applications without access their
personal files at any computer with internet access and
installation Cloud computing can be defined as a pool of
virtualized computing resources that allows users to gain
access to applications and data in a web-based environment on
demand.[10] . As use of cloud computing is growing rapidly
in every for m of organization, to provide security to the data
in cloud computing is the main issue to deal with.[1] Some
security issues like data loss and malicious insiders are reasons
to fear for customers using cloud computing services. In a
cloud computing environment, individuals and businesses
work with applications and data stored and/or maintained on
shared machines in a internet environment rather than
physically located in the home of a user or as corporate [1]
environment. Vulnerabilities in a particular cloud service or
cloud computing environment can potentially be exploited by
criminals and actors with malicious intent [4].
Traditional approach of using single cloud server, may also
lead in slowing down the retrieval of data. Dealing with single
cloud providers is becoming less favorable with customers due
to commonly occurring problems such as service availability
failure and the possibility that there are malicious insiders or
hackers in the single cloud. In recent years, there has been a
move towards multi-clouds, intercloud or cloud-of-clouds. [1]
This paper is focusing on using the multi cloud architecture to
deal with the security issues raised while using the single
cloud. In cloud computing organizations private data is given
to the third party, they want to avoid an untrusted cloud
provider.
2.”SINGLE” CLOUD SERVICE PROVIDERS
Privacy preservation and data integrity are the two main issues
faced by ”single” Cloud service providers. In his/her own
organization one can ensure strong security policies. But in
case of cloud computing one has to trust completely on his
service provider. [3] Also there is an overhead of managing
huge amount of data on a single server. It is easier for
malicious outsider to penetrate through security if the data is
not actually stored by organization itself; instead they are
trusting on third party for taking care of their data.
Disadvantage:
• Need High cost for cloud maintains process
• Data losses accrued.
• Can fail in ensuring the complete security from
possible threats

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3. OBJECTIVES OF MULTI-COULD
ARCHITECTURE
3.1 Security
In multi cloud data Storage, Data and Information will be
shared with external users, therefore cloud computing users
want to avoid important information from attackers or
malicious insider is of critical importance. In Iaas, users are
responsible for protecting operating system and cloud
providers must provide protection for users data. Resources in
the cloud are accessed through the Internet, frequently even if
the cloud provider concentrates on security in the cloud
infrastructure; the data is still transmitted to the users through
networks which may be insecure.
1. Data integrity 2. Data intrusion 3. Service availability these
are the three Security factors.
3.1.1 Data Integrity
The data stored in the cloud may lost from damage while
transferring from one place to another. Examples: Of the
threats of attacks from both inside and outside the cloud
provider.
3.1.2 Data Intrusion
Another security risk that may occur with cloud provider, such
as the any particular cloud service is hacked password. If
someone gains access to that cloud service password, they will
be able to access all of the accounts instance and resources.
Thus the stolen password permits the hacker to erase and to
modify all the data inside any virtual machine instance for the
stolen user account, or even disable its services. There is a
possibility for the users email (Amazon user name) to be
hacked for a discussion of the potential risks of email.
3.1.3 Service Availability
There is possibility that the service may be unavailable from
time to time. If any users files break the cloud storage policy,
the users web service may terminate for any reason at any
time. . Therefore Cloud provider maintain the backup and data
authentication which assures that returned data is same as
stored data is extremely important.
3.2 Performance
In single architecture, there is one main cloud server which
will process and response the request from the users. If more
than expected no of clients will requested for data/service to
the single server then the performance will slow down
Each user will have to wait more for accessing his/her data. In
case of overload, the server may hang sometime. In multi
cloud we have more than one cloud server to process the users
request So this divides the responsibility of handling requests
among several servers. So ultimately we can provide better
solution to our providers.
3.3 Cost-Reduction
Secured storage and data availability can be provided to the
customers in the market of economical distribution of
information in all the available service providers. In model
customer decide his data among their several SPs available in
the market. Also we provide decision for the customer, to
which SPs he must choose to access data and quality of
service offered by service provider.
4. ARCHITECTURE OF MULTI-CLOUD SYSTEM
Fig 1: SIC Architecture
SIC - Secure Inter-Cloud Architecture. The proposed
architecture is the 3 tier architecture. In our architecture, there
is one CSP i.e. cloud service provider. This is the main central
server which keeps the data about clients. Client in the
diagram represents any cloud service user. Clients/users does
not have any idea about where exactly the data/files has been
stored. Data is stored in cloud server. The servers may reside
in different physical locations. The CSP decides the servers to
store the data depending upon available spaces. We can use
load balancing algorithms for making the decision, on which
server we should actually store the data. The CSP will also
keep track about the files stored on each server. The cloud
servers will only store the data, but they will not have any
records about the user accounts, their passwords or encryption
and decryption keys.
CSP is central server, it must be well configured. Care should
be taken for protection of CSP. Cloud service provider acts as
an effective bridge between the user and cloud server. Cloud

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users, who have data to be stored in the cloud and rely on the
cloud for data computation, consist of both individual
consumers and organizations.
5. USE OF DATA ENCRYPTION TECHNIQUES
For ensuring more security in cloud environment, we can use
data encryption. If the data is distributed in multi cloud
environment as well as it is encrypted, we can protect our data
in even better way. The data which is uploaded by the user,
can be encrypted first and then we can store it on the cloud
server. This will be helpful in providing two-way security to
the customer’s data. To store the data in multicloud
environment The symmetric key or secret key algorithms are
the best choice for such applications. Symmetric key
algorithm is also known as the secret key encryption. It is a
cryptographic technique in which both the sender and receiver
of data use the same key for the purpose of encryption and
decryption of data. Symmetric key algorithms are suitable for
storing data in cloud multi cloud, as user should be able to
access his data easily.
Secret-key encryption algorithms use a same secret key to
encrypt and decrypt data. You must protect the key from
access by unauthorized agents, because anyone that has the
key can use it to decrypt your data or encrypt their own data,
claiming it originated from you. Secret-key encryption is also
referred to as symmetric encryption because the same key is
used for encryption and decryption. Secret-key encryption
algorithms are very fast (compared with public key
algorithms) and are well suited for performing cryptographic
transformations on large streams of data.[6]
Fig 2: Symmetric Encryption
6. FUTURE WORKS
In future, we aim to provide more secure cloud environment to
avoid the security risks. Cloud computing should not end with
only single cloud. The new concepts like multi-cloud, sky
computing should be adopted by the cloud service providers
for ensuring better security to customer’s data. Here the key
factor to focus is to increase the performance and scalability of
the cloud servers in multi-cloud environment. One should also
try to increase the level of security by using new and better
data encryption techniques. Also, the cloud service provider
(CSP) in the above architecture should be more secure, as it
stores the sensitive data like user accounts and encryption
keys. Our aim is that Clients would be able to access their
applications and data from anywhere at any time. They could
access the cloud computing system using any computer linked
to the Internet. Data wouldn’t be confined to a hard drive on
one user’s computer or even a corporation’s internal network.
One more challenge is to successfully implement the load
balancing algorithms for distributing the data among the cloud
servers. Providing the extra layers of security may result into
increase in the time to provide data access to the user. We
should also take care that user should able to gain easy and
timely access to his data, without any hurdle. Both the terms
security and ease in access to the data should go hands in
hands.
CONCLUSIONS
Even if the use of cloud computing have increased rapidly
during last decade, the security in the cloud environment is the
main issue to be focused on .it is the responsibility of a good
cloud service provider to ensure secure storage of data on the
cloud to his customer. In this paper, we proposed a secured
multi-cloud architecture in cloud computing, which seeks to
provide each customer secure environment to store his data
and he should be able to access his data without any failure or
delay. We are trying to provide two way security to the data,
by encrypting the data and by storing data on the multiple
servers. Also, the responsibility of storing the sensitive data
about the user accounts is taken by different central server
(CSP), which will help in securing the data from attacks. We
support the migration to multi-clouds due to its ability to
decrease security risks that affect the cloud computing user.
REFERENCES
[1]. Thom, ”Cloud computing security: From Single to
Multi-clouds”, Department of Computer Science and
Computer Engineering, La Trobe University, Bundoora 3086,
Australia. Mohammed A. AlZain, Eric Pardede, Ben Soh,
James A.
[2]. ” Data integrity proofs in cloud storage”, Infosys
Technologies Ltd Hyderabad, India. Sravan Kumar R,
Ashutosh Saxena,

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[3]. ”Using Multi Shares for Ensuring Privacy in Database-as-
a-Service”, 44th Hawaii Intl. Conf. on System Sciences
(HICSS),2011, pp. 1-9. M.A. AlZain and E. Pardede
[4]. ”Towards Of Secured Cost Effective Multi Cloud Storage
In Cloud Computing” , Communication Systems, Bannari
Amman Institute of Technology. K.RAJASEKAR1 and C.
KAMALANATHAN2
[5]. October3,2006. Amazon, Amazon Web Services. Web
services licensing agreement,
[6]. Tony Northrup, Microsoft .NET Framework Application
Development Fondation 2nd edition, Training Kit.
[7]. ”DepSky: dependable and secure storage in a cloud-of-
clouds”, EuroSys’11:Proc. 6thConf. On Computer systems,
2011, pp. 31-46. ] A. Bessani, M. Correia, B. Quaresma, F.
Andr and P. Sousa,
[8]. ”Toward a cloud computing research agenda”, SIGACT
News,40, 2009, pp. 68-80. K. Birman, G. Chockler and R.
van Renesse
[9]. Pratap Reddy Institute of Technology Hyderabad, India
”Security for Effective Data Storage in Multi Clouds”.
T.NEETHA Kommuri, CH.SUSHMA,Kommuri
[10]. Kim-Kwang Raymond Choo ”Cloud computing:
Challenges and future directions”.
BIOGRAPHIES
Ms. Kalyani Manik Borse
Ms. Ankita Govind .Deshpande
Ms. Ashlesha Amrut .Deshpande
Ms. Juily Shripad Hardas

Security in multi cloud data storage with sic

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