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Senthilkumar B.,St Peters University | Rajamani V.,Veltech Multitech Drrangarajan Drsakunthala Engineering College
Journal of Theoretical and Applied Information Technology | Year: 2014

This paper describes about novel VLSI implementation of key based substitution box(S-box) for Substitution-Permutation supported private key cryptosystems. Our design uses the mathematical properties of the (8, 4) Extended Hamming Code and its error control logic to produce 256 unique elements in one Sbox over finite Galois Field (GF) (28). Row - Column Index based selection of four 8bit vectors and their modulo-2 addition is employed for both byte substitution and its inverse. Proposed substitution method provides optimal substitution output probability with 40320 S-boxes for a single message byte over GF (28). Proposed method removes the direct relationship between linear and algebraic expressions of S-box vectors and byte substitution technique of S-box for strengthening our structure against linear and differential attacks. High nonlinearity penetration of original input message bits is achieved by applying shift based key schedules for round transformations and bit permutation based S-box vectors in proposed byte substitution. Proposed design is simulated and synthesized using VHDL coding for Spartan3E FPGA (XC3S500E-PQG208) and the simulation results are shown. Various substitution output results are shown by proposed S-boxes simulation for its optimal application. This paper concludes that novel Key dependent Substitution Box using Error Control Algorithm is an alternative solution to the existing threats on cryptography algorithms. © 2005 - 2014 JATIT & LLS. All rights reserved. Source


Rajendran S.,Dr. M.G.R. Educational and Research Institute | Balasubramanian K.,Veltech Engineering College | Rajeswari N.,Veltech Multitech Drrangarajan Drsakunthala Engineering College
International Journal of Applied Engineering Research | Year: 2015

A metaheuristics approach is chosen in cases where the exact methods are not enough to provide a solution. It is an iterative process to efficiently produce solutions which are closer to the global optimum.. This paper addresses the application of generic algorithm for a parallel machine flow line scheduling problem using the algorithm proposed for minimizing the makespan. Sequencing of operations to attain a feasible minimum makespan is one of the important requirements to achieve effective production from process planning. Since the problem is NP-hard, it is chosen to adopt genetic algorithm as it is one of the proven methods to search for a feasible optimal solution to the objective function. This paper addresses the methodology to obtain a near optimal sequence of jobs for an allocation of constrained resources with the objective of minimization of overall completion time or makespan. The methodology is based on creating a group of random solutions and uses the genetic operators of cross over and mutation to improve the solutions till an acceptable fitness level is reached. As the implementation of the local search is time consuming, a tool based on visual basic was developed to do the search faster. The tool had the options to search exhaustively or using the genetic algorithm methods. The computational experiments deployed indicate that it is feasible with the proposed methodology and procedures to arrive at better solutions faster than the conventional methods. © Research India Publication. Source


Sathyamurthy R.,Hindustan University | Nagarajan P.K.,Saengineering College | Subramani J.,Saengineering College | Vijayakumar D.,Veltech Multitech Drrangarajan Drsakunthala Engineering College | Mohammed Ashraf Ali K.,Hindustan University
Energy Procedia | Year: 2014

In this paper the effect of water mass on the performance of triangular pyramid solar still with and without latent heat energy storage was experimentally investigated. For comparing the productivity of solar still with and without LHTESS a solar still is designed, fabricated. Experiments are conducted in hot and humid climate of Chennai, India. It is found that there is an increase of production of fresh water with decrease in water mass. There is an increase of about 35% in production of fresh water with LHTESS than that of solar still without LHTESS. Also it was found that during the off shine period the fresh water produced from the still is higher compared to higher water mass. The solar still with and without LHTESS were found to be 5.5 L/m2day and 3.5 L/m2day. © 2014 Published by Elsevier Ltd. Source


Kabeer M.,B S Abdurrahman Crescent Engineering College | Rajamani V.,Veltech Multitech Drrangarajan Drsakunthala Engineering College | Bose S.,Anna University
Journal of Optoelectronics and Advanced Materials | Year: 2014

A two-dimensional numerical modeling of a uniformly doped nanoscale Double-Gate SOI n-MOSFET under illuminated condition including quantum mechanical effects has been developed. A self-consistent solution of 2-D Poisson-Schrödinger equation has been obtained. Finite differential method is used in solving the Schrödinger equation using mode space approach due to which size of the problem is reduced and sufficient accuracy is obtained. Leibmann's iteration method is used in solving Poisson equation with proper boundary conditions. The exact potential profile of the device under illuminated condition has been computed numerically. The electric field profile along the length and width of the channel and mobility of the carriers have also been studied extensively under illuminated condition to have an in depth analysis. Calculations are being carried out to examine the effect of illumination on the current-voltage characteristics, conduction band vs sub-band energy profile and sub-band electron density. The accuracy of the model has been verified by comparing the results with that calculated by nanomos 2.5 device simulator. Due to effect of photo generation, the device characteristics are strongly influenced. The proposed model is fairly accurate and can be used for accurate simulation of Opto Electronic Integrated Circuits (OEIC) using uniformly doped DG SOI n-MOSFET Photo detector. Source


Senthilkumar B.,St Peters University | Rajamani V.,Veltech Multitech Drrangarajan Drsakunthala Engineering College
International Journal of Engineering and Technology | Year: 2014

This paper describes about novel key expansion and its inversion technique for private key cryptosystems. Our design uses (8, 4) Extended Hamming Code and its error control logic to produce memory efficient key schedule generation algorithm. A mathematical relationship between 4bit word and its corresponding 4bit parity bits is shown. Simplicity, symmetry elimination, diffusion and non-linearity of the proposed key expansion technique are described as the key schedule generation criteria. Proposed method removes the usage of S-box to reduce the working memory of the algorithm. High nonlinearity penetration of original input message bits is achieved by applying modulo2 addition of code based key schedules for each round transformations. Security strength among these key schedules is achieved by intentional bit inversions among them with beyond the error correcting limitations of chosen code. Comparative results between proposed design and Rijndael algorithm is illustrated with the aid of Xilinx Simulation tool. This paper concludes that novel key generation technique by Error Control Algorithm of wireless communication channel is an alternative solution to the cryptosystems without S-box substitution and any lookup tables. Source

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