Wireless sensor networks are visualized in military, medicinal services applications and business, where the data at these filed is very important. Security of the information in the system relies on the cryptographic strategy and the techniques in which encryption and decryption keys are built up among the nodes. Dealing with the keys in the system incorporates node validation, key understanding and key refresh stages which represents an extra overhead on system assets. Both Symmetric and Asymmetric key methods when connected independently in WSN neglects to give a design reasonable to extensive variety of utilizations.

Security In mobile ad-hoc network (MANET) is a testing issue because of its unfastened characteristics, the feature of infrastructure less and nodes versatility. In outlining another security system for versatile Ad-hoc networks, one must consider the assaults varieties and in addition the qualities of the assaults that could be propelled facing the Ad-hoc networks and existing identification and moderation schemes. The analysis of these perspectives are outlined in this paper. A variety of attacks have been analyzed in Ad-hoc networks and also the proposed defenses against them. A short prologue to the sorts of assaults and conceivable counter measures to forestall or beat the assaults will be presented.

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One of the most important issues for mobile ad-hoc Networks (MANETs) is Security. The feature of MANETs posture both difficulties and openings in accomplishing security objectives, for example, privacy, validation, respectability, accessibility, control of access, and non-repudiation at the end. The techniques of Cryptographic are generally utilized for secure interchanges in wired and remote systems. Most mechanisms of cryptographic, for example, symmetric and asymmetric cryptography, frequently include the utilization of cryptographic keys. Nevertheless, every single cryptographic method will be useless if the management of the key is feeble. The Management of Key is additionally a focal segment in MANET security. The motivation behind key management is to give secure strategies to taking care of cryptographic keying materials.

There are a lot of application using wireless sensor network, including using in enemy environment. One of the most valuable issues in any WSN is security. The purpose of this paper is to study the security attacks and the defense mechanism over WSN. Trust Management will be clarified and its importance in security.