The Comparison of key management in hierarchical and distributed wireless sensor networks and providing new method for key management based on tree with the use of Exploratory Algorithm A

Wireless sensor network are composed of some small physical devices that called sensor, which they duty is collecting information from arrange of study and reporting the results to the requesting center. Although this networks have many advantages for easy installation in hazardous and inaccessible environments, have some disadvantages such as low security about unauthorized access to data, limitations in energy resources, memory and processing speed. For this reason, the need to explore different ways of routing and choosing a suitable method to reduce energy consumption in the networks is necessary. These networks have wide applications and thus are vulnerable about serious security problem. Therefore, to maintain security in this network that is one of the main challenges in wireless sensor networks is considered, we need apply encryption method with the help of create and publish secret key within the network. So that surveying different methods of key management and selecting appropriate solution is one of the essential needs of today. But limited nature of sensors and dynamic performance of this kind of networks prevents the normal use of key management in modern networks. For this reason, many lightweight key management solutions have been proposed to overcome these limitations. In this article we review the state of technical solutions and based on appropriate criteria evaluate two types of them and finally, we will provide a more efficient solution. The most common pre-distributed key management schemes, our focus will be on them. Thus will study, features such as security and network lifetime that can be used to develop some criteria

wireless sensor networks, key management, exploratory algorithm A