Sensor networks have been regarded as one of the emerging technologies of the 21 st century and have great future scope. They have been widely used in mission critical applications like military, health as well as civilian applications. The focus of this paper is on a security of sensor networks in various fields. Security is the major concern of a wireless sensor network especially in unattended areas. You will get a general introduction about wireless sensor networks in section I, section II explains the need for security in Wireless sensor networks, section III gives security challenges followed by section IV &V that give security and survivability requirements for a Wireless sensor network which follows attack categorization in section VI, followed by the security management schemes in section VII and finally conclusion in the last section VIII.
In this paper we have proposed a method to make a base for the monitoring of systems. The monitoring of systems could be from monitoring of movements in any particular area to the monitoring of any external electrical, mechanical device. Every person is pocketed with the cell. So, taking the advantage of the same we developed the software for the monitoring system using GSM technology. This will provide the owner, manager of the system to know about the working or any kind of default in the system. The goal is to find an improvement over the previous surveillance systems .The maintainability of the new and improved is quite efficient as it is easy to handle it by simple software demo. The facilities provided by it such as easy handling, a secrecy support, an immediate action are granted. A prototype is built in the Windows platform using C# to demonstrate the functioning of the entire system.
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