Enhancing Availability of Data in Mixed Homomorphic Encryption in Cloud

International Journal of Trend in Scientific Research and Development (IJTSRD)
Volume: 3 | Issue: 4 | May-Jun 2019 Available Online: www.ijtsrd.com e-ISSN: 2456 - 6470
@ IJTSRD | Unique Paper ID – IJTSRD25104 | Volume – 3 | Issue – 4 | May-Jun 2019 Page: 1310
Enhancing Availability of Data in Mixed
Homomorphic Encryption in Cloud
Bhargavi Patel
Assistant Professor, Engineering College, Tuwa, Godhra, Panchamahal, Gujarat, India
How to cite this paper: Bhargavi Patel
"Enhancing Availability of Datain Mixed
Homomorphic Encryption in Cloud"
Published in International Journal of
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Issue-4, June 2019,
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ABSTRACT
In Forthcoming times of information technology companies, cloud computing
updated as the structural model. There are so many benefits of cloud computing
in technical as well as in organization. But still there are many new objections
will carried in cloud computing for example in data security in cloud storage.
There are many approaches available for data security in cloud storage like
encryption with obfuscation technique, watermark security, data partitioning
technique. In above all the approaches, there is no possibility that cloud data
centers are operate computation on encrypted data so every time if user wants
to modify data, it is necessary to decrypt data. The most used technique for
providing security in cloud storage is Homomorphic encryption. In the
homomorphic encryption technique, there is no need to decrypt whole data
whenever user wants to update data. In the existing system used the mixed
homomorphic scheme which reduce noise level in homomorphic encryption
technique. The existing system focus on data corruption and data modification
but what if system failure and power failure occurs. The user data may be lossin
any reasons and user may not have any copy of data. The Existing system not
focus on data loss. So in proposed work focus on availability of data by erasure
code. By applying the erasure code if in any case user data is loss, will be
reconstructed which provide more security than existing system.
Keywords: Cloud Computing;DataSecurity;Homomorphic Encryption;Availability
of Data
INTRODUCTION
There are many resources are available in cloud computing
which leads in organization. By Combining the parallel
processing and distributed computing as well as grid
computing models makes the cloud computing.[10] There
are three types of services in cloud computing. First one is
the service which gives the user basic computing resources
like virtual machine, storage network in the form of cloud
storage and some processing power is called as
Infrastructure-as-a-service(IAAS).[10] Second one is the
service which provides the infrastructure of cloud with
development language and development tools on which
users can build and deploy their program is called as
Platform-as-a-service(PAAS).[10] Third one is the service
which yielded services to user. The services that runs on
infrastructure of cloud computing arranged by broker also
known as service provider is called as Service-as-a-
service(SAAS).[10] Users need not manage resources
provided by this three services, user just use this services as
payper-usage and pay the bill as per usage. There areseveral
challenges like security and privacy issues, multi-tenancy,
scalability, customizable GUI and Business logicaccordingto
business type etc.
RELATED WORK
Moving the data in the cloud provide the user with a great
efficiencies, since it don’t have tocare aboutthe complexities
of direct hardware management. By internet based online
services, using the huge amount of storage space and
customizablecomputingresources,thisplatformseliminates
the responsibilities of the local machines for data
maintenance .So for the integrity of the data users are
depended on the cloud service providers. Users’ datamostly
protected by applied distinct cryptographic algorithms like
AES, DES, RSA, etc. by broker to protect data from hackers.
All this techniques may also apply in cloud computing
environment to secure the users data files. By using the
algorithms the user loses control over the data. Therefore
without the knowledge of the data in cloud we should
provide security by HomomorphicEncryptionTechnique. As
focusing on data corruption, it is also important to focus on
data loss and data unavailability.
A. Data Security in Cloud Storage
Maintenance of data center is high in terms of cost for a low
budget organization who use small data center. The best
choice for low budget organization is to adopt cloud
computing as cloud computing provides cloud data center.
Using cloud data center, the management of data center is
removed. As water and electronic, the computation services
and storage can buy by low budget organization. The public
Storage provider can store data. [15] There are different
type of user, organizations and person can use the common
cloud data storage.
In cloud storage client is unaware of wherehisdataisstored.
On the above layer of cloud where network computing
system is stored all data. As cloud storage use by many
different persons, it is necessary to have data security in
IJTSRD25104

International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470
different levels. For different layer security, the cost should
be different. [15]
The user can lost their control from data in public cloud
so there is many security issues in public cloud. Because
all users data are stored in same place. [15]
In an organization only authorized personcanaccessthe
confidential data. So in private cloud the security is
needed to protect all storage servers. [15]
The main problem in cloud storage is how to safe users data.
In cloud, the service provider can guaranteeforprotection of
data but user cannot believe. By this Data securityis very big
thing of cloud storage. [15]
Fig 1. Framework to ensure data security [15]
Fig 1. Shows the framework which combine the scenario of
cloud storage provider and user. A guarantee between
service providers to user is called service level agreement.
Different Types of services, their qualities and userpayment
can define by SLA. In some times Users may check that data
is lost, stolen, crash. The possibility of data disaster can be
defined by SLA. There are many different technologies are
available which helps service provider to achieve SLA.
Different SLA have Different Cost.[15]
To provide data security in cloud storage there are mainly
three parts. [15]
Secure Storage
Transfer
Authority
Secure Storage: The data may be safe during any nature
disaster is the fundamental requirement of data security.
The data may be protected by dividing the user data into
number of small files and store it into differentplaces. If data
pieces in one data center or disk crashed, the data can be
resumed by left pieces. It’s an important method to remote
access performance and system availability. Cloud storage
service provider may construct data center in several
regional. Most of service provide file level save and acquire
service. How to separate files to pieces and how to place
these pieces is important to make files safe. File security
level from low to high is divided into single server level,
cross-server level, cross-cabinet-level, cross-data center
level. [15] These are divided by where the pieces stored in
cloud storage. The higher the security level higher storage
cost, cost is also higher in the Cloud computing system the
user can customize according to their different levels of the
circumstances of storage services.[15]
Transfer: The data must transfer though network. To make
the data available at any time, provider must separate data
to several data center and do some optimize in positionnear
the final user. Data saved in cloud storage often used for
cloud computing and share. To transfer an amount of data is
difficult for the existing network conditions.[15]
Authority: Authority is important to user to avoid
antiauthority access. For the storage provider, it needs todo
user authority and access control. During theuseraccess the
data in cloud, all operation should berecordedand traceable.
It’s important to make anyone else can’t see the data,
including administrator. [15]
PROPOSED SYSTEM FRMEWORK
The term Data availability is used by computer storage
manufacturers, storage service providers to describe
products and services that ensure that data continues to be
available at a required level of performance in situations
ranging from normal through disastrous. Anytime a server
loses power, for example, it has to reboot, recover data and
repair corrupted data. The time it takes torecover,known as
the mean time to recover (MTR),
could be minutes, hours or days. Data loss is an error
condition in information systems in which information is
destroyed by failures or neglect in storage, transmission, or
processing. Information systems implement backup and
disaster recovery equipment and processes to prevent data
loss or restore lost data. Data loss is distinguished from data
unavailability, which may arise from a network outage.
Although the two have substantially similar consequences
for users, data unavailability is temporary, while data loss
may be permanent.
In an existing system not focus on Data availability. In
proposed work the erasure code are used for availability of
data in case of failure. A Reed-Solomon erasure code adds
redundancy to the system to tolerate failures. By extending
the existing system after applying the homomorphic
encryption and RSA encoding and key switching matrices in
existing system then EDB block apply erasure code to this
block. So by providing the erasure code in any case system
failure or system reboot or any nature disaster happen the
data can be available to user. The user is not aware about
any failure and gets data availablewhenever required.When
user download the data first decode with erasure code and
then by applying the decryption process get the data.
B. System Architecture
In the proposed system, develop the model foravailabilityof
data in mixed-Homomorphic encryption scheme. Fig 2.
Shows the general layout of proposed work. The proposed
system work on four module: encryption, decryption done
by BGV Homomorphic encryption and for availabilityof data
encoding and decoding by Reed Solomon error correcting
erasure code.
Fig2. System Architecture of Proposed Work

PROPOSED ALGORITHM
A. Steps for Uploading File:
1. User file which he wants to upload divide into number of parts
2. All byte of user file can be encrypted by homomorphic encryption
3. Crete a separate file in which the decrypted data encoded with RSA algorithm and also have key-switching matrices.
4. Apply erasure code. There N number of bytes data in users file. This method generate thenumber of EncryptedDataBlock
per file (EDB). Every file contains number of EDB blocks. Every EDB block have key-switching matricesof k bytes,andtwo
block i.e. RSA and Decrypted data. Number of Distributed servers in cloud storage can stored this EDB block.
B. Algorithm Steps for Downloading File:
1. for finding the Encrypted data block, User can queries to all the Distributed storage servers
2. Apply decoding and recover the file if any file is missing.
3. Getting encrypted data block, user decode the data by RSA
4. After decoding, by applying the Homomorphic encryption user can decrypt the data and get the original file.
Fig3. Flow Chart of Proposed Work of Uploading Process
THEORETICAL RESULT ANALYSIS
Suppose after encryption we have ABCDEFGHIJKLMNOPencryptedformatdataavailable.Apply reedSolomon encodingtothis
data. The data converted into 4 X 4 matrix format as shown in figure 3.4. In this example, the four pieces of the file are each 4
bytes long. Each piece is one row of the matrix. The first one is “ABCD”. The second one is “EFGH”. And so on.
Fig4. Flow Chart of Proposed Work of Downloading Process

Fig5. Encrypted Data into 4X4 Matrix Format
The Reed-Solomon algorithm creates a coding matrix that you multiply with your data matrix to create the coded data. The
matrix is set up so that the first four rows of the result are the same as the first four rows of the input. That means that thedata
is left intact, and all it’s really doing is computing the parity.
The result is a matrix with two more rows than the original. Those two rows are called parity pieces. Each row of the coding
matrix produces one row of the result. So each row of the coding matrix makes one of the resulting pieces of the file.
Fig6. Encrypted Data multiply with Coding Matrix
Fig7.2 rows Data Loss out of 6 rows
The coding matrix, the matrix on the left, is invertible. There is an inverse matrix that is when multiplied by the coding matrix,
produces the identity matrix. As in basic algebra, in matrix algebra you can multiply both sides of an equation by the same
thing.
Fig8. Coding Matrix and Invert Matrix are cancel out by multiplying Invert Matrix both side
This leaves the equation for reconstructing the original data from the pieces that are available:
Fig9. Reconstruction of Original Data

CONCLUSION AND FUTURE WORK
The paper presents data availability in case of data loss and
system failure by using reed Solomon error correcting code
which is one kind of erasure code to provide better security
for cloud storage. The proposed algorithm only focus on use
of reed Solomon error correcting code as a erasure code for
provide better security and availability of data but not focus
on attacks may done on erasure code.
REFERENCES
[1] Maulik Dave, “Data Storage Security in Cloud
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[2] Dr. L. Arockian, S. monikandan,“EfficientCloudStorage
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[3] Boopathy D, M.Sundaresan, “Data Encryption
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[4] Jian Li, Sicong Chen, Danjie Song, “Security structureof
cloud storage based on homomorphic encryption
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[5] Amit Kumar Aman, Vijay Prakash, “Efficient Public
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[6] Md. Rafiqul Islam, Mansura Habiba, “Agent Based
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[12] Manoj Kokane,Prem Kumar Jain,Poonam
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[16] Cloud Computing for Dummies, Wiley publishing, Inc.
[17] William Stallings, “Cryptography and Network
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