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by
Padmapriya Praveenkumar |
Total Records (
19 ) for
Padmapriya Praveenkumar |
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Padmapriya Praveenkumar
,
Rengarajan Amirtharajan
,
K. Thenmozhi
and
John Bosco Balaguru Rayappan
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With the rabid development of the wireless technology, the gadgets that were
once a luxury, have now become a necessity. The wireless technology was first
developed for army utilisation. But later, because of the wide applications
it had, it became a global obligation. But, today, with the advent of internet,
the security of the wireless networks has been at a great stake. And also, the
new generation of wireless network demands higher data requirements which is
achieved by higher data bits per unit bandwidth because of a variety of multimedia
applications, cost efficiency, spectral efficiency and security. In this study
all of these challenging requirements are met by Orthogonal Frequency Division
Multiplexing (OFDM) along with steganography. It is an attractive and explorative
area for the next and future generation of wireless multimedia applications.
The major challenging issue in the design of an OFDM transceiver is its high
Peak-to-Average Power Ratio (PAPR). In this study, design of an OFDM system
adopting Partial Transmit Sequence (PTS) and Selected Mapping (SLM) techniques
were concentrated. We analyse the system performance for various values of subcarriers
and modulation schemes by computing Complementary Cumulative Distribution Function
(CCDF) and analysing the Bit Error Rate (BER). PAPR value is low as the number
of subcarriers has been increased. PTS outperforms SLM when complexity is considered
and SLM is preferred when the redundant bits in the information are high and
data embedding algorithm is included after modulation to ensure wireless security. |
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Padmapriya Praveenkumar
,
G.U. Priyanga
,
K. Thenmozhi
,
J.B.B. Rayappan
and
R. Amirtharajan
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The intellectual growth of computer communication lead to drastic improvement in wireless technology and shrunken the world into palms of the user which paved the path for the security attack issues. The development of the security system became the ultimate. Popular technique widely used in present scenario that provides a better security to secret information is image encryption. Multiple encryption technique has been adopted in this study. The secret image is block shuffled and then chaotic maps such as baker map, skew tent map and Arnold cat map are used to encrypt the image. Further the image is encrypted using Cipher Block Chaining (CBC) to contribute the final encrypted image. Metrics such as horizontal, vertical, diagonal correlation, Number of Changing Pixel Rate (NPCR) and entropy were calculated for various Digital Imaging and Communication in Medicine (DICOM) test images and the performance of the algorithm was analyzed. |
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R. Sridevi
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P. Philominathan
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Padmapriya Praveenkumar
,
John Bosco Balaguru Rayappan
and
Rengarajan Amirtharajan
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Background: The agenda of secret and secured communication is in the lead list of digital communication schemes. Image encryption
plays a lead role in both spatial and transforms domains. Materials and Methods: In this study, logistic and standard coupled mapping
were employed on a pre and post shuffled image to attain the higher-order cryptic image to convey information between private
nodes. The initial conditions to the maps were generated by a trigonometric function, which will provide sternness against hackers.
Results: To analyse the rigidness of the implemented algorithm, the standard metrics, that is the Unified Average Changing Intensity
(UACI), Number of Pixels Change Rate (NPCR), entropy, correlation values, pixel distribution and histogram tests were estimated. The
results were compared with the existing literature and found to be superior or comparable. Conclusion: First, the key space is 2256, which
is considerably resistive to brute-force attack. Second, the obtained NPCR, entropy, correlation coefficient and UACI values of 99.6901,
7.99, -0.0015 and 33.44, respectively, prove that the proposed method resists statistical and differential attacks. |
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K. Revathy
,
K. Thenmozhi
,
Padmapriya Praveenkumar
and
Rengarajan Amirtharajan
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Background: Cognitive Radio (CR) is an intelligent Software Defined Radio (SDR). The CR technology facilitates spectrum reuse and
assuages spectrum chomp. Effective spectrum sensing confirms cognitive radio users resourcefully using the under-utilized frequency
band without triggering destructive interference to primary users. Recently CR plays a vital role in the development of unguided
communications system. Materials and Methods: This study examines the use of adaptive batch testing to find the spectrum holes of
a specified bandwidth in a given Wide Band (WB) of interest and also designed a crisis based adaptive batch and Fuzzy Inference System
(FIS) management in CR. Results: In place of testing and allocating a single slot for a user, this method can accommodate N number of
users in a set of band during emergency conditions. The FIS is used to estimate the channel condition by analyzing the four parameters
like signal power, speed, remoteness and effectiveness. Conclusion: The proposed system reduces the average sensing time, management
time as a function of SNR. Number of users and the efficiency is also high when more number of users was managed at same time. |
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Padmapriya Praveenkumar
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K. Thenmozhi
,
J.B.B. Rayappan
and
Rengarajan Amirtharajan
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We live in an era where hacking and unauthorized access attempts
to data are so common. There is a need to secure data before it is transmitted.
Addition of overhead bits and modulation techniques decrease the capacity and
increase the cost. Both the channel capacity and the cost to set up the communication
system have to be optimal. So intimidating is a feature called multiple access
used for this purpose. Multiple access also improves capacity by simultaneously
transmitting large number of messages. There is very less or no interference
between the signals since each of them is polarized orthogonally or encoded
using different coding sequences or sent as bursts in different time slots.
Particularly Code Division Multiple Access (CDMA) makes it more difficult for
the hacker to access the transmitted data. If the message is thrown to all the
users only the intended receiver has the same coding sequence to decode it.
So, others can’t access the message. Even if the message is detected, use
of steganography makes it all the more difficult for the hacker to decode the
message. This increases the security multifold. The aesthetic appeal of CDMA
and steganography together has revolutionized the present world communication
systems. In this study, the performance of CDMA is analysed by embedding confidential
information at three levels namely after interleaving, spreading and modulator.
The Bit Error Rate (BER) performance comparison graphs with and without information
hiding at three levels are analysed using BPSK, QPSK and QAM schemes. |
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Padmapriya Praveenkumar
,
K Thenmozhi
,
J.B.B. Rayappan
and
Rengarajan Amirtharajan
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The kinetics of higher data requirements in the upcoming wireless
generation is engendered by the fact that the usage of high quality multimedia
applications in the form of data, audio, SMS and video is on the rise. In order
to meet the challenging needs of the increasing data rate requirements, the
wireless system employs Orthogonal Frequency Division Multiplexing (OFDM). Security
is the need of the hour in today’s wireless technological advancement.
In this study, OFDM with Reed Solomon codes (RS) as Forward Error correction
codes (FEC) has been proposed to achieve lower Bit Error Rate (BER) and data
embedding has been carried out to ensure security in wireless communication.
Further RS codes are used to restore the cover object. |
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Padmapriya Praveenkumar
,
K. Thenmozhi
,
J.B.B. Rayappan
and
Rengarajan Amirtharajan
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The prospects of the next generation wireless broadband applications
will be enhanced by the features like improved Signal to Noise Ratio (SNR) and
variable higher data rates. The Orthogonal Frequency Division Multiplexing (OFDM)
system offers better tolerance against multipath effects faced by fading channels.
Forward Error Correction (FEC) codes meliorate the system performance. In this
study, firstly the data is encoded using Convolution encoders with Puncture
codes in OFDM system. Then, the secret message is embedded and passed through
Rayleigh and Rician fading channels. The BER graph prior and after embedding
the confidential data are compared and simulated using BPSK modulation scheme.
The system is made more reliable by reducing the redundancy, errors in the signals
and making it more secure and robust in fading environment. |
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Padmapriya Praveenkumar
,
G.S. Hemalatha
,
Bharathsimha Reddy
,
K. Thenmozhi
,
J.B.B. Rayappan
and
Rengarajan Amirtharajan
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The prerequisite of internet and multimedia communication in the present wireless age is impregnability and higher data rata. In this study, a pragmatic approach was accomplished by the Simulink model of Orthogonal Frequency Division Multiplexing (OFDM) using image steganography incorporating BPSK and QPSK modulation schemes. To contemplate the distortion in the image, the discerning distortion metrics called as Mean Square Error (MSE) and Peak Signal to Noise Ratio (PSNR) were computed. The BER of OFDM system was also analysed. |
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Padmapriya Praveenkumar
,
K. Thenmozhi
,
John Bosco Balaguru Rayappan
and
Rengarajan Amirtharajan
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Wireless communication is an incipient technique to increase
portability, but is inept on grounds of security and capacity. Wireless communication
coupled with multiple access techniques help in resolving these issues and aid
in providing variable data rates. The security aspects can be palliated by using
spread spectrum with information hiding mechanisms. This study analyses confidential
data hiding using spread spectrum scheme added to Orthogonal Frequency Division
Multiplexing (OFDM) system adopting different modulation schemes. Performance
analysis is done with and without confidential data embedding considering Additive
White Gaussian Noise (AWGN) channel. Code Division Multiple Access (CDMA) are
compared and analysed with Multicarrier CDMA (MC CDMA) schemes using Bit Error
Rate (BER) performance. |
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Padmapriya Praveenkumar
,
K. Thenmozhi
,
John Bosco Balaguru Rayappan
and
Rengarajan Amirtharajan
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Improved Signal to Noise Ratio (SNR) and variable higher data rates will pave a way to a brighter future for the next generation broadband applications of wireless communication. The OFDM system tolerates robustness against the multipath effects encountered by the fading channels. Enhanced system is achieved by using Forward Error Correction (FEC) codes. The attrition of errors in signals will increase the reliability of the system. In this study, secret data has been embedded after encoding the data using Convolutional encoders and passed over OFDM system. At the receiver end, Artificial Neural Network (ANN) helps better BER. The signals are passed over an OFDM receiver and decoded using Viterbi decoders. |
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Padmapriya Praveenkumar
,
R. Deepak
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K. Thenmozhi
,
John Bosco Balaguru Rayappan
and
Rengarajan Amirtharajan
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In the era of wireless communication, the World Wide Web is
the brain child of all the new technological development. This digital world
has speeded up the data transfer and communication speed a manifold, creating
new goods and services all along. Along with the development of internet, developed
ways of hacking, modifying and stealing it also increased. There is an increasing
demand to augment the data rates and to provide greater fidelity. Thus, technology
provides us the finesse for increasing robustness over fading channels. The
most prominent solution for increased speed is OFDM. And the security issues
can be taken care of by embedding confidential data after encoding the message
using cyclic codes. |
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Padmapriya Praveenkumar
,
K. Thenmozhi
,
J.B.B. Rayappan
and
Rengarajan Amirtharajan
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Stupendous advances in Digital Communication have brought
about the advent of internet culture benefiting the people in many ways. Just
as fire is a good servant, but a bad master, so is the case with internet. With
internet, stealing and unauthorised usage of data remains unrestrained. In addition,
use of high multimedia applications demands for higher data rates. To accommodate
the challenging needs of higher data rate requirements, Orthogonal Frequency
Division Multiplexing (OFDM) proves to be the propitious solution. Hacking over
wireless environment can be staved off by incorporating the emerging information
hiding techniques with OFDM system. This study analyses the performance of OFDM
system using modulation schemes like Binary Phase Shift Keying (BPSK), Quadrature
Phase Shift Keying (QPSK) and Quadrature Amplitude Modulation (QAM) and then
the confidential information is embedded after interleaving and passed over
AWGN channel. Interleaving serves two purposes primarily it reduces burst errors
and it needs two different keys intact, one to stipulate the scrambling of the
data bits and the other to identify the secret data embedding. It is observed
from the simulation results that the BER of the system can be improved by rearranging
the input data streams through interleaving, thereby reducing the random errors
due to noisy wireless channel environment. The BER graph is simulated for various
modulation schemes prior to embedding and after embedding the confidential information. |
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Padmapriya Praveenkumar
,
P. Rajalakshmi
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G.U. Priyanga
,
K. Thenmozhi
,
John Bosco Balaguru Rayappan
and
Rengarajan Amirtharajan
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Security has become the most indispensible part of any form
of communication. There are different ways through which it is brought about,
out of which one of the efficient implementation through steganography and encryption.
Steganography conceals the existence of a secret message throughout the communication
thereby providing enhanced security. In this study, a methodology has been proposed
to perform encryption on an image with the help of Secret Steganography Code
for Embedding (SSCE) code. A mapping technique has been proposed to combine
quantum truth table and LSB based embedding. The SSCE has been employed to provide
encryption, followed by quantum table before embedding the secret data. The
proposed methodology supports both images and text as cover as well as secret
data. In the proposed scheme, embedding has been included with encryption to
provide security multifold. The implementation was carried out using Visual
Basic. NET and results are presented. |
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Padmapriya Praveenkumar
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K. Thenmozhi
,
John Bosco Balaguru Rayappan
and
Rengarajan Amirtharajan
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Brobdingnagian may be the precise word for the usage of internet
and advanced expertise in the globe in our day. Indeed, all sorts of this online
communication go hand in hand with the so called major apprehension, information
security. Since all kinds of digital files play an imperative role in internet
operation, it is indispensable to defend the key features of private communication
namely, seclusion, uprightness and legitimacy. This threat, in a roundabout
way, has led to the breakthrough of information security rationales. Striking
among these are Cryptography and Steganography, primordial skills pursued for
the sake of secret sharing. The startling thing is that with the fruition of
technology, these are giving prolific outcomes even now. Cryptography possesses
such a litheness that its blend, in the company of other fields of study, facilitates
offer much more options to explore security issues. This study envisions an
inimitable approach to security in the context of encryption and embedding incorporating
shuffling, chaotic equations in conjunction with Blowfish encryption algorithm.
Here, encryption is performed on images followed by embedding secret data. The
latter is done not literally but indirectly. This pitch endows with randomness
and security with all the persuasive traits of encryption. Validation is given
in terms of Mean Square Error (MSE), Peak Signal to Noise Ratio (PSNR), Relative
Entropy (RE), entropy and correlation values. Experimental results are illustrated
to vindicate the performance of this objective. |
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Padmapriya Praveenkumar
,
Rengarajan Amirtharajan
,
K. Thenmozhi
and
John Bosco Balaguru Rayappan
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Orthogonal Frequency Division Multiplexing (OFDM) has come to the rescue of the bandwidth constraint owing to the burgeoning digital multimedia applications. The serial data is made parallel and transmitted over multiple orthogonal frequencies with bandwidth of each subcarrier considerably lesser than the coherence bandwidth of the channel. This study aims to review the present state of art in Error Correcting Codes (ECC) in OFDM, generated by methods like Convolutional Encoding, using Reed-Solomon Codes and Turbo codes. Furthermore the deployment of Artificial Neural Networks (ANN), to train the system for higher fault tolerance in OFDM is detailed. |
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Padmapriya Praveenkumar
,
Rengarajan Amirtharajan
,
R. Sai Janani
,
K. Thenmozhi
and
J.B.B. Rayappan
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There are numerous criteria in running an enterprise. Apart from trading goods and services, or may be both to clients, emphasis should be laid on maintaining the business model that comprises of maintenance of intellectual properties and decisive testimonials as well. In this regard, up to date technological proficiencies be of great assist as everything is now digital and online. Though sound different, technology and administrative terms go hand in hand. Of all one domain that catch the attention instantly is secret sharing and secret communication. This study is one such work. Digital multimedia applications, coming into the limelight in the recent years have impacted the bandwidth requirements and caused an ever soaring demand for broadband wireless application. On the other hand, wireless communication that uses fixed modulation fails to satisfy the needs as its efficiency is stultified by the fading channels. This stydy proposes the adaptive modulation scheme in OFDM (Orthogonal Frequency Division Multiplexing) system to counteract fading in the transmission power and the transfer function of frequency selective channel. The prime aim is to maximise the total capacity and transmit power without vitiating the quality of service at the receiver. It can be achieved by making the system smart and subsume some intelligence into it. We make the system adapt itself to the channel conditions and choose the well-suited service at that instant. Simulation results have made it clear that adaptive modulation in OFDM system offers the choice of modulation and FEC (Forward Error Control Codes) with variable rates. The essence of adaptation is maintained even while embedding in wireless transmission to serve the security purposes. Bit Error Rate (BER) graph plotted prior to embedding is analyzed and compared with the one plotted for embedded data. |
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Padmapriya Praveenkumar
,
Rengarajan Amirtharajan
,
K. Thenmozhi
and
J.B.B. Rayappan
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Wireless communication with its enhanced efficiency, greater flexibility, mobility and reduced cost has encompassed human needs and sophistications to a greater extent. Several techniques adopted in the wireless standards solely contribute to its heightened demand. Orthogonal Frequency Division Multiplexing (OFDM) is one such technique adopted to provide robust and high speed networks by countenancing signal overlap. The data transmission over wireless, in general, is unsecure and open to the hands of the hackers. A method has to be devised to uniquely identify the copyright owner of the data and prevent the misuse of it. However, on the negative side, the hackers are on par with the experts in this field to combat against piracy. This necessitates the introduction of a method to impart security to the data being transmitted. This study embeds secret data bits in punctured convolutional encoder’s output which are then encrypted using Chaotic means to uphold discretion and then traversed through OFDM system. Integrity is made certain by four-level encryption of secret bits and is stored as key in Cyclic Prefix’s (CP) output. Comparison graphs for the performance of Bit Error Rate (BER) are plotted for different modulation schemes with different rates of punctured convolutional codes. These plots are for puncture patterns with convolutional encoder before and after infixing the secret data. Widespread metrics for performance measurement like BER and correlation values are computed. This estimation reveals the security and arbitrariness of data encryption both with and without embedding the secret. |
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Padmapriya Praveenkumar
,
Rengarajan Amirtharajan
,
K. Thenmozhi
and
J.B.B. Rayappan
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Information security is a prime concern especially when it comes to business
and corporate sectors where off the record information should be given utmost
importance. Very cooperative especially to business enterprise, modern day expertise
has contributed a lot towards sharing a surreptitious data. The field of wireless
communication has surmounted many hurdles in the past few years and is now finally
capable of supporting higher data rates thanks to the development of Orthogonal
Frequency Division Multiplexing (OFDM). It is the most ideal format for broadband
communication to meet its need for higher data rates. This study further augment
the usefulness of OFDM communication by making it secure to avert data piracy.
This study propose an idea of embedding the secret message at the real part
of Inverse Fast Fourier Transform (IFFT) output of OFDM system and performance
of the system is examined for various modulations. Thus, this study is a conjunction
of wireless and data security which serves the purpose of secret sharing and
can be applicable and suitable to entrepreneurial activities. |
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Padmapriya Praveenkumar
,
Rengarajan Amirtharajan
,
K. Thenmozhi
and
J.B.B. Rayappan
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This study proposes Orthogonal Frequency Division Multiplexing (OFDM), endorsed by encryption and concatenated Error Correction Codes (ECC). OFDM, as the name suggests exploits the carriers’ orthogonality properties and Frequency Division Multiplexing (FDM) caters to the bandwidth requirements for the broadband applications. To reduce the errors due to the channel noise conditions, concatenated codes utilizing Reed Solomon (RS) codes and convolutional codes are used. Its encoded output is encrypted using the chaotic means to espouse discretion before passing through OFDM channel. Error performance of the scheme is analysed using Additive White Gaussian Noise (AWGN) channel. Comparative graphs are plotted for the performance of Bit Error Rate (BER) on different modulation schemes with different inner and outer code rates. For performance measurements, metrics like BER and Correlation values are computed. |
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