Research And Implementation Of Dynamic Key Management Methods In Wireless Networks

The natural openness of wireless networks makes communication between wireless devices more convenient and brings more security risks.With the continuous improvement of computer processing capabilities,traditional cryptographic solutions are facing increasing security threats.The emergence of a large number of micro-Io T devices has also brought a huge impact on the traditional key management methods.In order to solve the security problem of wireless networks,this paper starts from the characteristics of wireless network channel such as dynamic change and frame loss,and according to dynamic encryption theory,proposes a dynamic key management method,then based on dynamic key mana gement method,builds a dynamic key communication platform.The platform uses the data transmitted by the communication parties at the link layer to generate dynamic keys.It constantly updates the session key during the communication process,making it difficult for the adversary to obtain the key information at a certain moment,thereby ensuring the confidentiality of the wireless communication data.Different kinds of wireless network nodes have differences in computing power,storage capacity,etc.For wireless networks with limited node capabilities,this paper designs a probabilistic model to analyze traditional key propagation protocols and improves the protocol,and proposes a group key infection scheme.Aiming at widely used 802.11 wireless networks and the limitations of group key distribution schemes,this paper also proposes a dynamic key management method.Based on 802.11 protocol and stop-wait protocol,a dynamic key communication platform is designed.The dynamic key communication platform includes two nodes,the sending end and the receiving end,and the working layer is the link layer.The data format of the transmission is 802.11 data frames,and the data encryption and decryption adopt d ynamic keys.The platform is in charge of communication between nodes on the one hand,constructs,processes and transmits data frames,and on the other hand manages the dynamic keys of all nodes.The platform uses a dynamic key generation algorithm to update the keys.The two nodes extract a portion of the data information during communication,perform a series of calculations,generate new keys,and ensure the synchronization of key updates betweenthe nodes.During the data transmission process,because the key used by the legitimate node keeps changing,even if the adversary breaks the key at a certain moment,it cannot pose a threat to the subsequent data transmission of the legitimate node.The performance analysis experiments show that the dynamic key generation algorithm has high execution efficiency and security,can effectively solve the key management problems of large-scale wireless networks,and improve the security performance of wireless networks.