Secure Cloud Environment Using RSA Algorithm

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056
Volume: 03 Issue: 02 | Feb-2016 www.irjet.net p-ISSN: 2395-0072
© 2016, IRJET | Impact Factor value: 4.45 | ISO 9001:2008 Certified Journal | Page 143
SECURE CLOUD ENVIRONMENT USING RSA ALGORITHM
P.suresh
Research Scholar,
Department of computer science,H.H The Rajahs college (Autonomous)India
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Abstract : During the last decide, information security has
become a major issue. encryption and decryption data have
recently been widely investigated and developed because there
is a demand for stronger encryption and decryption which is
very hard crack. cryptography plays major roles to fulfillment
these demands. now days, many of researcher have proposed
many of encryption and decryption algorithm such as AES,
DES, RSA, and others. an RSA system generally belongs to
the category of pkcs . rsa encryption is one of the public-key
method that have been popular, the rsa algorithm is used in
many application. although the security of rsa is beyond
doubt, the evolution in computing power has caused a growth
in the necessary key length. the performance characteristics of
rsa are observed by implement the algorithm for computation.
in this paper, RSA was implemented through an asymmetric
key algorithm ,encryption and decryption procedure over
different key size.
KEY TERMS
RSA algorithm, Cloud computing, Cryptography,
Encryption and Decryption, symmetric and
asymmetric algorithm.
1.INTRODUCTION
Cloud computing is biggest buzz in the computer world
these days. Cloud computing is everywhere. the locality
of physical resource and device being accessed are in
general not known to the end user. it also provide service
for users to build up, deploy and manage their applications
'on the cloud ',which involves virtualization of resources
that maintains and manages by itself. NIST definition of
cloud computing. cloud computing is a model for enabling
convenient, on demand network access to a shard pool of
configurable computing resources (eg, networks, server,
storage, application ,and services)that can be rapidly
provisioned and released with minimal management
effort or service provider interaction". one of the first
cloud offerings was cloud storage and it remains a popular
answer. cloud storage allows data stored remotely to be
temporarily cached on mobile phones, desktop computer,
or other internet linked devices. security and cost are the
top issues in this field and very greatly. five
characteristics-on demand self-service, board network
access, resource poring, rapid elasticity, and measured
service. four deployment model-private clouds, public
clouds, community clouds, and hybrid clouds. three
service model-software as service(saas),platform as a
service(paas),and infrastructure as a service(iaas). it is
important to highlights cloud computing is research
challenges from an enterprise perspective because cloud
computing is not simply about a technological
improvement of data center but a fundamental change in
how it is provisioned and used. companies such as Amazon
, Google and Microsoft have invested waste sums money
in building their public clouds and they seem to be leading
the way in the technological innovation of cloud by
rleasing frequent updates and new feature for there
services. this paper cryptography technical using cloud
computing. this cryptography can help emergent
acceptance of cloud computing by more security
companies. the first level of security where cryptography
can help cloud computing is secure storge. cryptography is
the art or science of keeping message secure by converting
the data into non readable forms. now a days cryptography
is considered as a combination of three algorithm .these
algorithm as symmetric key algorithm, asymmetric key
algorithm ,and hashing.this paper problem asymmetic key
algorithm are those algorithm that use different keys for
encryption and decryption.the two keys are private keys
and public keys.public keys used by the sender for
decryption and the private key is used for decryption of
data by reciewer.in cloud computing asymmetric key
algorithm used to generate keys for encryption.the most
common asymmetric key algorithm for cloud are using
rsa,ike,diffie helman key exchange.using asymmetric key
algorithm based rsa cryptosystem realize the properties of
the multiplicative homomorphic encryption.Ronald
Rivist,Adi shamir and leonard Adleman hava invented the
rsa algorithm and after is inventors.rsa uses modular
exponential for encryption and decryption. RSA uses two
exponents, a and b ,where a is public and b is private. so
this paper of RSA , the primary advantages of RSA is
increased security as the private keys do not ever need to
be transmitted or revealed to anyone. where as in a secret
-key system. there is always a change that an enemy
could discover the security key while it is being
transmitted. Another major advantage of public-

keysystem is that can provide a method for digital
signatures. Authentication via secret key system. a
disadvantage of using public key cryptography for
encryption is speed they are very slow in processing.
2.LITERATURE SURVEY
Rahul bhatnagar et al.(2013) in security in cloud
computing have proposed an analysis of technical
component and some research in threats for cloud
computing users and threats for cloud service providers
then provide many security, data and privacy protection,
virtualization security, security arichitecture, model and
frame work, security management and audit technology.
shivashankar ragi(2011) with in a research thesis security
approach for protecting data in cloud computing have
described the security threats and identify the safety
approaches for security in cloud computing and measured
the protection challenges and security methods of clouds.
in cryptography the advanced encryption standard(AES) is
a symmertic key encryption standard. each of these
cipher has 128-bit block size ,bit respectively[1]. survey of
cryptography algorithm for cloud computing
rashmi,manaoj jhuria,dr.shailendra.author discuss about
the cloud computing is the emerging field in the modern
era.cloud computing is defind as the set of resources or
services offered through the internet to the user on their
demand by cloud providers. it conveys everything as
service over the internet based on user demand ,for
instance operating system, hardware, srorag. resources,
and software.cloud computing conveys everything as a
service over the web supports user demand.to secure the
cloud storage[2]. AES in cryptography the advanced
encryption standard is a symmetric key encryption
standard each of these cipher has a 128-bit block size, with
size of 128,192 and 256 bit respectively. elliptic cureve
cryptography provides confidentiality and authentication
of data between cloud.it explores data security in cloud
computing by implementing digital signature and
encryption[4].during the data transformation to the cloud
we use standard encryption method to secure the
operation and the storage of the data. holomorphic
encryption to execuite operation and the storage of the
storage of the data without decryption. it enables
providing result of the calculations on encrypted data
without knowing the raw data on which the calculation
was carried out[5].the management of security in cloud
computing ramgovind s.et.al[2010].in this paper author
discuss about the management of the cloud computing.
cloud computing is new and emerging information
technology that changes the way it architectural solution
are put forward by means of moving towards the theme of
virtualization of data storage,of local networks as well as
software cloud computing. has elevated it to newer limits
by offering the market environment data storage and
capacity with flexible scalable computing processing
power to match elastic demand and supply. using cloud
computing can help in keeping on as it budget to a bare
minimum. cloud computing can computing can deliver a
real time using many different types resources such as
hardware, software, virtual storage once logged on to a
cloud[6]. data security in cloud architecture based on diffie
hellman and elliptical curve cryptography neha tirthani
ganesan r. in this paper, author discuss about the data
security in cloud computing. now a days, cloud computing
becomes a difficult task. cloud computing refer to a
network computer,connected through internet, sharing
the resources given by cloud providers. cloud computing is
a model for enabling convenient , on demand network
access to a shared pool of configurable computing
resources. the security in cloud computing is big issue the
security threats such as maintenance of data integrity,
data hiding and data safety dominate[7].
3.PROPOSED WORK
RSA: This is an internet encryption and authentication
system that uses an algorithm developed in 1977 by Ron
Rivest, adi shamer,and leonard adleman.the RSA algorithm
is the most commonly used encryption.till now it is the only
algorithm used for private and public key generation and
encryption.it is a fast encryption.
KEY GENRATION Before the data is encryption key
generation should be done. this process is done between
the cloud service provider and the user.

ENCRYPTION
Consider the user a that needs to send a message to b in
secured manner using rsa algorithm. now e is b's public
key. since e is public, a is allowed accessed to e. for
encryption the message m of a which is in the range
o<m<n is converted to cipher. where the cipher text
DECRYPTION
Now the cipher text c is a sent to b from a.user b is calculated the
message with its private key β, where message RSA
this an internet encryption and authentication system that uses an
algorithm, based asymmetric encryption algorithm uses two keys
instead of one. one is a private only known to the recipient of the
message and the other is a public key known to everyone and can be
freely distributed. either key can be used to encrypt and decrypt the
message. however if only key a is used to encrypt the message then
only key b can be used decrypt it.converse,it key b is used to
encrypt the message then only key a can be used to decrypt it. RSA is
the most common asymmetric cryptography algorithm. the minimum
recommended key length is 1024 bits.
4.METHODOLOGY USED
RSA is widely used public key algorithm rsa stands for Ron
Rives, Adi shamir and lenadleman ,who first publicly
RSA ALGOPRITHM
1)SELECT two large prime number a and b.
2)compute n=a*b the computed n is made public.
3)now compute f(n)=(a-1)*(b-1).
4)choose a random number 'e' as the public in the range
1<e<f(n) such that GCD(e,f(n)=1.
5)find private key d such that mod f(n), where d and f(n)
are mutually prime.
ENCRYPTION
1)consider the user a that needs to send a message to b in secured
manner using rsa algorithm.
2)now e is b's public key. since e is public, a is allowed access to
e.
3)for encryption the message m of a whitch is in the range
0<M<N< IS converted to cipher.
4)where the cipher text
DECRYPTION
1)now the cipher text c is sent to b and a.
2)user b calculate the message with its private key β,where
message .
USER’S
CLOUD
DATA OWNER
VALIDATE
RSA
RESPONSE
FIGURE 2: ARCHITECTUREOF RSA
ENCRYPTION
PLAINTEXT PLAINTEXT
ENCRYPTION
WITH
PUBLICKEY
DECRYPTION
WITH
PRIVATEKEY
CIPHERTEXT
FIGURE 1:RSA ASYMMETRIC KEY

described it in 1977.IN OUR PROPOSED WORK, we are
using RSA algorithm to encrypt the data to provide
security so that only the concerned user can access it .by
securing data, we are not allowing unauthorized access to
it. user data is encrypted first and then it is stored in the
cloud. when required, user place a request for the cloud
provider, cloud provider authentication the user and
delivers the data. RSA is a block cipher ,in which every
message is mapped to an integer.RSA consists of public-
key and private key. in our cloud environment, public key.
it can be decrypted with the corresponding private-key
only. SECURITY OF RSA , rsa consist of public key and
private , public-key. for encryption and private key for
decryption. key generation, encryption and decryption
this soul of RSA algorithm. the security of rsa algorithm is
lies on integer factorization problem. so the key selection
is very impotent in rsa generally used said select a
strongest key pair a and b to generate modules n. the
condition of selection of a and b is both numbers. strong
prime numbers have certain property. it's provide
difficulty to factor n by using any specific factoring method
(n=a*b), public key or encryption key (e,n) is known to
ever one, if can factor n it's easy to discover d. so the
selection of prime numbers is very important. otherwise
the method used for selecting prime number must be
efficient. this is the main feature of rsa. the key size decides
the strength of cryptosystem. the size of rsa key typically
refer to the size of n. if and b has larger size number with
same length, it's very hard to factor the product n. the size
of the key is depends on the security need. if the larger size
it's provide good security on algorithm. this is
cryptography algorithm which is used for encryption of
plaintext to cipher vice versa. it uses mathematical
computation for generating public and private key which
are used for encryption or decryption purpose.rsa is used
when secure data transmitted over the internet. in rsa
cryptosystem, user share their public key with receiver for
decrypting message. it keep secret it's private key. private
key never shares with other users. rsa algorithm uses
mathematical function to compute public or private key. it
takes two large prime numbers and multiplies and applies
some additional operation on it and generates. two set of
keys. in rsa algorithm factor which is product after
multiplying of two prime numbers. if any knows about the
factor which is used in encryption process then the
encryption can easily break.RSA encryption is strong
when the factor are not disclosed, anyone can break the
encryption.
5.EXPERIMENTAL RESULT
Secure the cloud manage data for cloud
provider(csp).security goals of data include three points
namely: confidential, integrity, and auditablity(CIA).
confidentiality of data in the cloud is accomplished by
encryption/decryption process. encryption/ decryption
process in modern days is considered combination of two
type of algorithm .they are (i)symmetric key algorithm
cryptography such as data encryption standard (DES)
advanced encryption standard (AES),Ronls code(RCN),and
triple des. Asymmetric -key algorithm such as Rivest ,
shamir, and adleman(RSA),elliptic curve(EC),Diffi-
Hillman(DH). In This Paper
FACTORS DES AES RSA
CONTRIBUTER IBM 75 RIJMAN
JOAN
RIVEST
SHAMIR 78
KEY LENGTH 56-BITS 128,192
AND 256
BASED ON
NO.OF BIT
IN N=A*B
BLOCK SIZE 64 BITS 128 BITS VARTANT
SECURITY
RATE
NOT
ENOUGH
MEDIUM GOOD
EXECUATION
TIME
SLOW MEDIUM FAST
FIGURE 3: comparison between different algorithm
NUMBER OF CHARACTER
FIGURE 4: PERFORMANCE OF
ENCRYPTION GRAPH

asymmetric algorithm are those algorithm which, use the
same key for both encryption and decryption. hence the
key is kept secret. symmetric algorithm have the
advantage of consuming too much of computing power
and it works with high speed in encryption. symmetric key
algorithm are divided into two types: block cipher and
stream cipher. in block cipher input is taken as a block of
plaintext of fixed size is applied on to block of the same
size as the block of plaintext is obtained. in rsa
cryptosystem, used share their public key with receiver for
decryption message. it keep secret it is private key never
shard with other user. for this paper different type
algorithm to compare secure algorithm.
in this Table efficient cryptosystem can produce best
possible result if key size comparable to the size packet to
be transmitted over the network. algorithm on the basis of
parameter like key length, block size, type and features.
As we know that the data is stored on some else location in
the cloud computing so we need high processing speed as
well as high security. here the graph shows the performance of
our proposed scenario. Bars are showing that how much
time it will take to encrypt data. different experimental
result are shown in the graph which are done on the basis
of different experiments.
6.CONCLUSION
cloud computing is the latest trend in it. but security is the
biggest challenge in this area. each and every day new
security prevention method is discovered, but it's not a
permanent solution. encryption is the best security
method , now different kinds of encryption technique
apply in cloud computing environment , some extend
hacking can be prevented in this way. so it's very
important to provide a good level security in this
environment is the one of decide the strength of the
cryptosystem, when we selected large key size prime
number, its cannot be easily factored and discovered. so
provide a good level security the keys used should be
powerful. but generation main problem of RSA is
increasing key generation time when we select large key
size number, the key generation time is also increase, this
problem can be solved by applying asymmetric key
algorithm. a drawback of RSA using public key
cryptography for encryption is speed they are medium
process. FUTURE scope using various algorithm as
described cloud security can be ensured in real time
environment.
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encryption. schema,15th international conference on
0
2
4
6
8
16 32 48 64
(SEC)
FOR
DECRYPTION
NUMBER OF CHARACTER
FIGURE 5:PERFORMANCE OF
DECRYPTION GRAPH

information technology new generation (page127-
130)year 2008.

Secure Cloud Environment Using RSA Algorithm

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