Improving the Security of Time Synchronization in WSN

Time synchronization is an important issue in wireless sensor network(WSN). Many applications of wireless sensor networks need local clocks of sensor nodes to be synchronized, requiring various degrees of precision. Some strict resources limitations of WSN make traditional synchronization methods unsuitable for it. Hence there are many synchronization algorithms for sensor networks specially. The security problems should be specially taken into account for these new methods. In this paper, some major time synchronization protocols are presented and the security threatens for these protocols in WSN are analyzed. Finally, some countermeasures for these security problems are proposed.