Research Area:  Internet of Things
Key agreement is one the most essential steps when applying cryptographic techniques to secure device-to-device (D2D) communications. Recently, several PHY-based solutions have been proposed by leveraging the channel gains as a common randomness source for key extraction in wireless networks. However, these schemes usually suffer a low rate of key generation and low entropy of generated key and rely on the mobility of devices. In this paper, a novel secret key extraction protocol is proposed by using interference in wireless D2D fading channel. It establishes symmetrical keys for two wireless devices by measuring channel gains and utilizing artificial jamming sent by the third party to change the measured value of channel gains. We give a theoretically reachable key rate of the proposed scheme from the viewpoint of the information theory. It shows that the proposed scheme can make hundred times performance gain than the existing approaches theoretically. Experimental results also demonstrate that the proposed scheme can achieve a secure key distribution with a higher key rate and key entropy compared with the existing schemes.
Author(s) Name:  Chunwei Lou, Mingsheng Cao , Rongchun Wu, Dajiang Chen, and Hua Xu
Journal name:  Wireless Communications and Mobile Computing
Publisher name:  Hindawi
Volume Information:  Volume 2021
Paper Link:   https://www.hindawi.com/journals/wcmc/2021/6642605/