By Mrunalini Motilal Shete and Pragati Damodar Hipparkar
Department of Computer Engineering,
Sahakar Maharshi Shankarrao Mohite-Patil Institute of Technology & Research, India
In this article,
the encryption algorithms have been proposed to make cloud data secure,
vulnerable and gave concern to security issues, challenges and also comparisons
have been made between AES, DES and RSA algorithms to find the best one
security algorithm, which has to be used in cloud computing for making cloud
data secure and not to be hacked by attackers.
RSA Algorithm
The most
common Public Key algorithm is RSA, named for its inventors Rivest, Shamir, and
Adleman (RSA). RSA is basically an asymmetric encryption and decryption
algorithm. It is asymmetric in the sense, that here public key distributed to
all through which one can encrypt the message and private key which is used for
decryption is kept secret and is not shared to everyone.
How RSA is
going to work in cloud environment is explained as: RSA algorithm is used to
ensure the security of data in cloud computing. In RSA algorithm we have
encrypted our data to provide security. The purpose of securing data is that
only concerned and authorized users can access it. After encryption data is
stored in the cloud. So that when it is required then a request can be placed
to cloud provider. Cloud provider authenticates the user and delivers the data
to user. As RSA is a Block Cipher in which every message is mapped to an
integer. In the proposed cloud environment, Public key is known to all, whereas
Private Key known only to user who originally owns the data. Thus encryption is
done by the cloud service provider and decryption is done by the cloud user or
consumer. Once the data is encrypted with the Public key, it will be decrypted
using the corresponding Private Key only.
AES Algorithm
Advanced
Encryption Standard (AES), also known as Rijindael is used for securing
information. AES is a symmetric block cipher that has been analyzed extensively
and is used widely now-a-days. How AES works in cloud environment? AES,
symmetric key encryption algorithm is used with key length of 128-bits for this
purpose. As AES is used widely now-a-days for security of cloud. Implementation
proposal states that First, User decides to use cloud services and will migrate
his data on cloud. Then User submits his services requirements with Cloud
Service Provider (CSP) and chooses best specified services offered by provider.
When migration of data to the chosen CSP happens and in future whenever an
application uploads any data on cloud, the data will first encrypted using AES
algorithm and then sent to provider. Once encrypted, data is uploaded on the
cloud, any request to read the data will occur after it is decrypted on the
users end and then plain text data can be read by user. The plain text data is
never written anywhere on cloud. This includes all types of data. This
encryption solution is transparent to the application and can be integrated
quickly and easily without any changes to application. The key is never stored
next to the encrypted data, since it may compromise the key also. To store the
keys, a physical key management server can be installed in the user’s premises.
This encryption protects data and keys and guarantees that they remain under
user’s control and will never be exposed in storage or in transit. AES has
replaced the DES as approved standard for a wide range of applications.
DES Algorithm
The Data
Encryption Standard (DES) is a block cipher. It encrypts data in blocks of size
64 bits each. That is 64 bits of plain text goes as input to DES, which
produces 64 bits of cipher text. The same algorithm and key are used for
encryption and decryption, with minor differences. The key length of this
algorithm is 56 bits; however a 64 bits key is actually input. DES is therefore
a symmetric key algorithm.
Conclusion
Encryption
algorithms play an important role in data security on cloud and by comparison
of different parameters used in algorithms, it has been found that AES
algorithm uses least time to execute cloud data. DES algorithm consumes least
encrypt-ion time. RSA consumes longest memory size and encryption time.
By doing
implementation for all algorithms in IDE tool and JDK 1.7, the desired output
for the data on cloud computing has been achieved. In today’s era demand of
cloud is increasing so the security of the cloud and user is on top concern.
Hence, proposed algorithms are helpful for today’s requirement. In future
several comparisons with different approaches and results to show effectiveness
of proposed framework can be provided.
Publication Details:
This article is an excerpt from a technical paper titled - "Data Secure in Cloud Computing Using Encryption Algorithms", published at International
Journal of Science and Research (IJSR) ISSN (Online): 2319-7064 Index
Copernicus Value (2013): 6.14 | Impact Factor (2013): 4.438 Volume 4 Issue 3,
March 2015 www.ijsr.net Licensed Under Creative Commons Attribution CC BY