72 страниц. 2011 год. LAP Lambert Academic Publishing In this closely-knit society nothing can be accomplished alone. So, we take this opportunity to thank all the people who are as much part of this project as we are.We would like to express gratitude to our project in-charge Mr.S. S. kumbhar, Lecturer, Dept. of Computer Engineering & IT and Mr. Prasanna H. Kulkarni, Symantec Pune, for their invaluable advice and encouragement. From the onset they have taken a keen interest in the development of project and we are very grateful to them for their time and efforts.We are also indebted to my Head of Department Prof. A. A. Sawant for his continuous support and encouragement, which helped us immensely during completion of the project.In the end, we would like to thank parents and our friends who have directly and indirectly been involved in helping us such an endeavor.