Cloud Computing is an information technology type which is used to access information and sharing of data on remote site. By using cloud computing one has not to worry about load of local data storage to store his data. Security And authentication of data is must while using this kind of services. Various factors are presents there which can affect security of data. This paper provide an idea about security and authentication operation .This paper explain some encryption scheme as well as RSA and how to improve security of a data using Symmetric Tokens. This paper proposes a multilevel authentication technique that helps us to enhance the security of data storage in the cloud computing systems. We provide combined approach DES and AES using RSA to protect clients' authentication data such as user name and password.
Abstract-Digital circuit systems are the backbone of the digital world and play a crucial role in diverse field technology applications viz. computer, mobile, home appliances, in the military, air forces, navy, medical and space and much more. In the present paper, the realization of digital circuit systems using Matlab and Simulink is presented. The aim of this paper is to guide the searchers about the methodology for design digital systems using Matlab and Simulink tools. In era of digital world, the understanding of realization of digital electronic circuits using simulation approach will play guiding role in the research Keyword-Logic Gates, Digital circuit systems, converters, Matlab, Simulink, Matlab Function I. INTRODUCTION This paper addresses various digital devices and developing their MATLAB function script implementation using embedded matlab function in Simulink model environment. Matlab stands for matrix laboratory, is a general purpose, scientific computing integrated environment, commercial software package. It has editor window for Matlab script and Simulink (graphical environment) to solve a simple mathematical problem to highly complex research-oriented problems. Matlab Simulink, its toolboxes, and block sets, are well known and a leading mathematical application package in various scientific disciplines. It is a high-level computation and simulation language that allows easy and reliable manipulation of vectors and matrices. The latest version of Matlab with data structures, excellent graphics, Graphical user interface (GUI), Simscape and Simulink, is an invaluable tool for research level and implementation.Matlab can apply to solve different problems in diverse engineering fields [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Engineering simulation, using Simulink graphical programming plays a crucial role in understanding and assessing the operation of a physical system. Simulink built add-on Matlab, is a very interactive tool for modelling, simulating and analyzing multi-domain systems. Matlab is an ideal tool for qualitative and quantitative analysis of generic and particular problems related to science and technology. It has found the huge scope in laboratory projects. Hence, it has been adopted for teaching a variety of courses in science and technology. The benefits of Matlab and Simulink have been well documented by several researchers [1][2][3][4][5][6][7][8].This paper proposes the methodology in Matlab, to realize digital circuit system (DCS) on text-based description function, m.file and graphical programming Simulink model using embedded Matlab function. In current work, the graphical Simulink model approach uses block diagram realization with the MATLAB function script. Function script implementation is a text based m.file description of the digital system under reference, which can be written in any text editor for the output of DCSs.
The resource management system is the central component of cloud computing. A resource management system matches requests to resources, schedules the matched resources, and executes the requests using scheduled resources. Resource allocation and resource scheduling is considered as very important part of resource management system. This paper discusses priority based scheduling technique on heterogeneous resources in cloud computing based upon PERT technology. This scheduling model minimizes the completion time, makespan.
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